diff --git a/projects/lilith/src/python/lilith/interpreter.py b/projects/lilith/src/python/lilith/interpreter.py
index 50f4f6a..a4b0c9d 100644
--- a/projects/lilith/src/python/lilith/interpreter.py
+++ b/projects/lilith/src/python/lilith/interpreter.py
@@ -4,7 +4,7 @@
 
 import typing as t
 
-from .parser import Apply, Block
+from .parser import Apply, Block, Symbol
 from .reader import Module
 
 
@@ -49,8 +49,7 @@ def lookup(runtime, mod, locals, name):
     if name in mod.defs:
         return mod.defs.get(name)
 
-    else:
-        raise err
+    raise err or KeyError
 
     # FIXME (arrdem 2021-08-21):
     #   How do we ever get references to stuff in other modules?
@@ -68,11 +67,14 @@ def eval(ctx: Runtime, mod: Module, locals: Bindings, expr):
     # Pointedly not assert that the module is ACTUALLY in the runtime,
     # We're just going to assume this for convenience.
 
-    if isinstance(expr, Apply):
+    if isinstance(expr, Symbol):
+        return lookup(ctx, mod, locals, expr)
+
+    elif isinstance(expr, Apply):
         # FIXME (arrdem 2021-08-21):
         #   Apply should be (apply <expr> <args> <kwargs>).
         #   Now no distinction is made between strings ("") and symbols/barewords
-        fun = lookup(ctx, mod, locals, expr.name)
+        fun = eval(ctx, mod, locals, expr.target)
         # Evaluate the parameters
         args = eval(ctx, mod, locals, expr.args.positionals)
         kwargs = eval(ctx, mod, locals, expr.args.kwargs)
@@ -89,8 +91,10 @@ def eval(ctx: Runtime, mod: Module, locals: Bindings, expr):
         return tuple(eval(ctx, mod, locals, i) for i in expr)
 
     elif isinstance(expr, dict):
-        return {eval(ctx, mod, locals, k): eval(ctx, mod, locals, v)
-                for k, v in expr.items()}
+        return {
+            eval(ctx, mod, locals, k): eval(ctx, mod, locals, v)
+            for k, v in expr.items()
+        }
 
     else:
         raise RuntimeError(f"Can't eval {expr}")
diff --git a/projects/lilith/src/python/lilith/parser.py b/projects/lilith/src/python/lilith/parser.py
index 844564d..fb48391 100644
--- a/projects/lilith/src/python/lilith/parser.py
+++ b/projects/lilith/src/python/lilith/parser.py
@@ -3,12 +3,11 @@ Variously poor parsing for Lilith.
 """
 
 import typing as t
-import re
 from importlib.resources import read_text
 
-import lark
+from lark import Lark, v_args, Transformer
 
-GRAMMAR = read_text('lilith', 'grammar.lark')
+GRAMMAR = read_text("lilith", "grammar.lark")
 
 
 # !foo[bar]
@@ -26,7 +25,7 @@ class Args(t.NamedTuple):
 
 
 class Apply(t.NamedTuple):
-    name: Symbol
+    target: object
     args: Args
 
 
@@ -47,19 +46,20 @@ class Block(t.NamedTuple):
         return "\n".join(self.body_lines)
 
 
+id = lambda x: x
+
+
 class TreeToTuples(Transformer):
     @v_args(inline=True)
     def string(self, s):
         return s[1:-1].replace('\\"', '"')
 
-    def int(self, args):
-        return int(args[0])
-
-    def float(self, args):
-        return float(args[0])
-
-    def number(self, args):
-        return args[0]
+    null = lambda self, _: None
+    true = lambda self, _: True
+    false = lambda self, _: False
+    int = v_args(inline=True)(lambda self, x: int(x))
+    float = v_args(inline=True)(lambda self, x: float(x))
+    number = v_args(inline=True)(lambda self, x: x)
 
     def word(self, args):
         """args: ['a'] ['a' ['b', 'c', 'd']]"""
@@ -107,11 +107,7 @@ class TreeToTuples(Transformer):
 
 
 def parser_with_transformer(grammar, start="header"):
-    return lark.Lark(grammar,
-                     start=start,
-                     parser='lalr',
-                     transformer=TreeToTuples())
-
+    return Lark(grammar, start=start, parser="lalr", transformer=TreeToTuples())
 
 
 def parse_expr(buff: str):
diff --git a/projects/lilith/src/python/lilith/reader.py b/projects/lilith/src/python/lilith/reader.py
index c3ffc5c..b676837 100644
--- a/projects/lilith/src/python/lilith/reader.py
+++ b/projects/lilith/src/python/lilith/reader.py
@@ -4,11 +4,12 @@ Lilith's reader takes parsed blocks and applies languages, building a module str
 
 import logging
 import typing as t
-from .parser import Block, Args, parse_buffer
+from .parser import Block, Args, parse_buffer, Symbol
 from warnings import warn
 
 log = logging.getLogger(__name__)
 
+
 class Module(t.NamedTuple):
     name: str
     defs: t.Dict[str, Block]
@@ -19,7 +20,7 @@ def read_buffer(buffer: str, name: str = "&buff") -> Module:
 
     m = Module(name, {})
     for block in parse_buffer(buffer, name):
-        if block.app.name == "def":
+        if block.app.target == Symbol("def"):
             if len(block.args.positionals) == 2:
                 def_name, expr = block.args.positionals
                 m.defs[def_name] = Block(expr, block.body_lines)
diff --git a/projects/lilith/src/python/lilith/repl.py b/projects/lilith/src/python/lilith/repl.py
index 4c173b4..bb4ff66 100644
--- a/projects/lilith/src/python/lilith/repl.py
+++ b/projects/lilith/src/python/lilith/repl.py
@@ -20,6 +20,7 @@ STYLE = Style.from_dict(
     }
 )
 
+
 def print_(fmt, **kwargs):
     print_formatted_text(FormattedText(fmt), **kwargs)
 
@@ -27,12 +28,15 @@ def print_(fmt, **kwargs):
 if __name__ == "__main__":
     session = PromptSession(history=FileHistory(".lilith.history"))
     runtime = Runtime("test", dict())
-    module = Module("__repl__", {
-        "print": print,
-        "int": int,
-        "string": str,
-        "float": float,
-    })
+    module = Module(
+        "__repl__",
+        {
+            "print": print,
+            "int": int,
+            "string": str,
+            "float": float,
+        },
+    )
 
     while True:
         try:
@@ -49,11 +53,7 @@ if __name__ == "__main__":
             continue
 
         try:
-            result = eval(
-                runtime, module,
-                Bindings("__root__", None),
-                expr
-            )
+            result = eval(runtime, module, Bindings("__root__", None), expr)
             print_([("class:result", f"⇒ {result!r}")], style=STYLE)
         except Exception as e:
             print(e)
diff --git a/projects/lilith/test/python/conftest.py b/projects/lilith/test/python/conftest.py
index cbf694b..7be6349 100644
--- a/projects/lilith/test/python/conftest.py
+++ b/projects/lilith/test/python/conftest.py
@@ -21,6 +21,7 @@ def kwargs_grammar():
 def arguments_grammar():
     return parser_with_transformer(GRAMMAR, "arguments")
 
+
 @pytest.fixture
 def header_grammar():
     return parser_with_transformer(GRAMMAR, "header")
diff --git a/projects/lilith/test/python/test_interpreter.py b/projects/lilith/test/python/test_interpreter.py
index 3b89daf..3351c18 100644
--- a/projects/lilith/test/python/test_interpreter.py
+++ b/projects/lilith/test/python/test_interpreter.py
@@ -4,31 +4,40 @@
 
 from lilith.interpreter import Bindings, Runtime, eval
 from lilith.reader import Module
-from lilith.parser import Args, Apply
+from lilith.parser import Args, Apply, Symbol
 
 import pytest
 
 
-@pytest.mark.parametrize('expr, expected', [
-    (1, 1),
-    ([1, 2], [1, 2]),
-    ({"foo": "bar"}, {"foo": "bar"}),
-])
+@pytest.mark.parametrize(
+    "expr, expected",
+    [
+        (1, 1),
+        ([1, 2], [1, 2]),
+        ({"foo": "bar"}, {"foo": "bar"}),
+    ],
+)
 def test_eval(expr, expected):
-    assert eval(
-        Runtime("test", dict()),
-        Module("__repl__", dict()),
-        Bindings("__root__", None),
-        expr
-    ) == expected
+    assert (
+        eval(
+            Runtime("test", dict()),
+            Module("__repl__", dict()),
+            Bindings("__root__", None),
+            expr,
+        )
+        == expected
+    )
 
 
 def test_hello_world(capsys):
-    assert eval(
-        Runtime("test", {}),
-        Module("__repl__", {"print": print}),
-        Bindings("__root__", None),
-        Apply("print", Args(["hello, world"], {}))
-    ) is None
+    assert (
+        eval(
+            Runtime("test", {}),
+            Module("__repl__", {Symbol("print"): print}),
+            Bindings("__root__", None),
+            Apply(Symbol("print"), Args(["hello, world"], {})),
+        )
+        is None
+    )
     captured = capsys.readouterr()
     assert captured.out == "hello, world\n"
diff --git a/projects/lilith/test/python/test_parser.py b/projects/lilith/test/python/test_parser.py
index cc4514d..0ceca97 100644
--- a/projects/lilith/test/python/test_parser.py
+++ b/projects/lilith/test/python/test_parser.py
@@ -1,66 +1,121 @@
 """tests covering the Lilith parser."""
 
-from lilith.parser import Apply, Args, Block, GRAMMAR, parse_buffer, parser_with_transformer, Symbol
+from lilith.parser import (
+    Apply,
+    Args,
+    Block,
+    GRAMMAR,
+    parse_buffer,
+    parser_with_transformer,
+    Symbol,
+)
 
 import pytest
 
 
-@pytest.mark.parametrize('example, expected', [
-    ("1", [1]),
-    ("1, 2", [1, 2]),
-    ("1, 2, 3", [1, 2, 3]),
-])
+@pytest.mark.parametrize(
+    "example, expected",
+    [
+        ("1", [1]),
+        ("1, 2", [1, 2]),
+        ("1, 2, 3", [1, 2, 3]),
+    ],
+)
 def test_parse_args(args_grammar, example, expected):
     assert args_grammar.parse(example) == expected
 
 
-@pytest.mark.parametrize('example, expected', [
-    ("foo: bar", {Symbol("foo"): Symbol("bar")}),
-    ("foo: bar, baz: qux", {Symbol("foo"): Symbol("bar"), Symbol("baz"): Symbol("qux")}),
-])
+@pytest.mark.parametrize(
+    "example, expected",
+    [
+        ("foo: bar", {Symbol("foo"): Symbol("bar")}),
+        (
+            "foo: bar, baz: qux",
+            {Symbol("foo"): Symbol("bar"), Symbol("baz"): Symbol("qux")},
+        ),
+    ],
+)
 def test_parse_kwargs(kwargs_grammar, example, expected):
     assert kwargs_grammar.parse(example) == expected
 
 
-@pytest.mark.parametrize('example, expected', [
-    ("1", ([1], {})),
-    ("1, 2", ([1, 2], {})),
-    ("1, 2, 3", ([1, 2, 3], {})),
-    ("foo: bar",
-     ([], {Symbol("foo"): Symbol("bar")})),
-    ("foo: bar, baz: qux",
-     ([], {Symbol("foo"): Symbol("bar"),
-           Symbol("baz"): Symbol("qux")})),
-    ("1; foo: bar, baz: qux",
-     ([1], {Symbol("foo"): Symbol("bar"),
-            Symbol("baz"): Symbol("qux")})),
-])
+@pytest.mark.parametrize(
+    "example, expected",
+    [
+        ("1", ([1], {})),
+        ("1, 2", ([1, 2], {})),
+        ("1, 2, 3", ([1, 2, 3], {})),
+        ("foo: bar", ([], {Symbol("foo"): Symbol("bar")})),
+        (
+            "foo: bar, baz: qux",
+            ([], {Symbol("foo"): Symbol("bar"), Symbol("baz"): Symbol("qux")}),
+        ),
+        (
+            "1; foo: bar, baz: qux",
+            ([1], {Symbol("foo"): Symbol("bar"), Symbol("baz"): Symbol("qux")}),
+        ),
+    ],
+)
 def test_parse_arguments(arguments_grammar, example, expected):
     assert arguments_grammar.parse(example) == expected
 
 
-@pytest.mark.parametrize('example, expected', [
-    ('!def[syntax]',
-     Block(Apply(Symbol('def'), Args(['syntax'], {})), [])),
-    ('!frag[lang: md]',
-     Block(Apply(Symbol('frag'), Args([], {'lang': 'md'})), [])),
-    ('!frag[foo; lang: md]',
-     Block(Apply(Symbol('frag'), Args(['foo'], {'lang': 'md'})), [])),
-    ("!int.add[1, 2]",
-     Block(Apply(Symbol('int.add'), Args([1, 2], {})), [])),
-])
+@pytest.mark.parametrize(
+    "example, expected",
+    [
+        ("!def[syntax]", Block(Apply(Symbol("def"), Args([Symbol("syntax")], {})), [])),
+        (
+            "!frag[lang: md]",
+            Block(Apply(Symbol("frag"), Args([], {Symbol("lang"): Symbol("md")})), []),
+        ),
+        (
+            "!frag[foo; lang: md]",
+            Block(
+                Apply(
+                    Symbol("frag"),
+                    Args([Symbol("foo")], {Symbol("lang"): Symbol("md")}),
+                ),
+                [],
+            ),
+        ),
+        ("!int.add[1, 2]", Block(Apply(Symbol("int.add"), Args([1, 2], {})), [])),
+    ],
+)
 def test_parse_header(header_grammar, example, expected):
     assert header_grammar.parse(example) == expected
 
 
-@pytest.mark.parametrize('example, expected', [
-    ("!frag[lang: md]",
-     [Block(Apply(Symbol('frag'), Args([], {Symbol("lang"): Symbol("md")})), [])]),
-    ("""!frag[lang: md]\nHello, world!\n\n""",
-     [Block(Apply(Symbol('frag'), Args([], {Symbol("lang"): Symbol("md")})), ["Hello, world!", ""])]),
-    ("""!frag[lang: md]\nHello, world!\n\n!def[bar]""",
-     [Block(Apply(Symbol('frag'), Args([], {Symbol("lang"): Symbol("md")})), ["Hello, world!", ""]),
-      Block(Apply(Symbol('def'), Args([Symbol("bar")], {})), [])]),
-])
+@pytest.mark.parametrize(
+    "example, expected",
+    [
+        (
+            "!frag[lang: md]",
+            [
+                Block(
+                    Apply(Symbol("frag"), Args([], {Symbol("lang"): Symbol("md")})), []
+                )
+            ],
+        ),
+        (
+            """!frag[lang: md]\nHello, world!\n\n""",
+            [
+                Block(
+                    Apply(Symbol("frag"), Args([], {Symbol("lang"): Symbol("md")})),
+                    ["Hello, world!", ""],
+                )
+            ],
+        ),
+        (
+            """!frag[lang: md]\nHello, world!\n\n!def[bar]""",
+            [
+                Block(
+                    Apply(Symbol("frag"), Args([], {Symbol("lang"): Symbol("md")})),
+                    ["Hello, world!", ""],
+                ),
+                Block(Apply(Symbol("def"), Args([Symbol("bar")], {})), []),
+            ],
+        ),
+    ],
+)
 def test_block_parser(example, expected):
     assert parse_buffer(example) == expected
diff --git a/projects/lilith/test/python/test_reader.py b/projects/lilith/test/python/test_reader.py
index efab4ea..4ccb1af 100644
--- a/projects/lilith/test/python/test_reader.py
+++ b/projects/lilith/test/python/test_reader.py
@@ -1,15 +1,28 @@
 """Tests covering the reader."""
 
-from lilith.parser import Apply, Args, Block
+from lilith.parser import Apply, Args, Block, Symbol
 from lilith.reader import Module, read_buffer
 
 import pytest
 
 
-@pytest.mark.parametrize('example, expected', [
-    ("""!def[main, lang[lil]]\nprint["hello, world"]\n""",
-     Module("&buff", {"main": Block(Apply('lang', Args(["lil"], {})), ["print[\"hello, world\"]"])}))
-])
+@pytest.mark.parametrize(
+    "example, expected",
+    [
+        (
+            """!def[main, lang[lil]]\nprint["hello, world"]\n""",
+            Module(
+                "&buff",
+                {
+                    Symbol("main"): Block(
+                        Apply(Symbol("lang"), Args([Symbol("lil")], {})),
+                        ['print["hello, world"]'],
+                    )
+                },
+            ),
+        )
+    ],
+)
 def test_read(example, expected):
     got = read_buffer(example)
     assert got == expected