diff --git a/src/doodles/__init__.py b/src/doodles/__init__.py
index 9ef8b52..70332b1 100644
--- a/src/doodles/__init__.py
+++ b/src/doodles/__init__.py
@@ -19,9 +19,9 @@ then there are public/non-public files.)
 """
 from .doodles import Doodle, Group
 from .lines import Line
-from .shapes import Circle, Rectangle
+from .shapes import Circle, Rectangle, Polygon
 from .color import Color
 from .text import Text
 
 
-__all__ = ["Doodle", "Group", "Line", "Circle", "Rectangle", "Color", "Text"]
+__all__ = ["Doodle", "Group", "Line", "Circle", "Rectangle", "Color", "Text", "Polygon"]
diff --git a/src/doodles/doodles.py b/src/doodles/doodles.py
index 889cdf4..dfb9b47 100644
--- a/src/doodles/doodles.py
+++ b/src/doodles/doodles.py
@@ -12,11 +12,13 @@ This is a reasonable example of when two classes might reasonable share a file.
 """
 import random
 import copy
+import time
 from abc import ABC, abstractmethod
-from typing import Callable, Self
+from typing import Callable, Self, Any
 from .color import Color
 from .world import world
 
+UpdateCallable = Callable[[float], Any]
 
 class Doodle(ABC):
     """
@@ -38,7 +40,7 @@ class Doodle(ABC):
 
     # annotations for instance attributes
     _parent: Self | None
-    _updates: list[Callable]
+    _updates: list[tuple[str, UpdateCallable, dict[str, Any]]]
     _color: tuple[int, int, int]
     _alpha: int
     _z_index: float
@@ -110,17 +112,11 @@ class Doodle(ABC):
         new._register()
         return new
 
-    # Dynamic Update Logic ############
+    # animate #######################
 
-    # These methods relate to a WIP feature
-    # designed to demonstrate a functional hybrid
-    # approach to having objects update themselves.
-    #
-    # This feature isn't complete, or documented yet.
-    # TODO
-
-    def register_update(self, method, *args):
-        self._updates.append((method, args))
+    def animate(self, prop_name: str, update_func: UpdateCallable, **kwargs) -> Self:
+        self._updates.append((prop_name, update_func, kwargs))
+        return self
 
     def update(self) -> None:
         """
@@ -130,9 +126,19 @@ class Doodle(ABC):
         Can be overriden (see examples.balls)
         to provide per-object update behavior.
         """
-        for method, args in self._updates:
-            evaled_args = [arg() for arg in args]
-            method(*evaled_args)
+        cur_time = time.time()
+
+        for prop, anim_func, kwargs in self._updates:
+            # attributes on Doodle are set via setter functions
+            # prop is the name of a setter function, which we
+            # retrieve here, and then populate with the result
+            # of anim_func(time)
+            # kwargs (if set) are passed through directly to anim_func
+            # allowing constant arguments to be passed as well as
+            # the variable function-based argument (anim_func)
+            setter = getattr(self, prop)
+            new_val = anim_func(cur_time)
+            setter(new_val, **kwargs)
 
     # Setters #######################
 
diff --git a/src/doodles/examples/clock.py b/src/doodles/examples/clock.py
index 0d75495..acfe4a6 100644
--- a/src/doodles/examples/clock.py
+++ b/src/doodles/examples/clock.py
@@ -1,9 +1,31 @@
 import time
+import math
 from doodles import Circle, Color, Line, Group
 
+
+def color_func(t):
+    cycle = [Color.RED, Color.ORANGE, Color.GREEN, Color.BLUE]
+    return cycle[int(t) % 4]
+
+
+def size_func_factory(min_size, factor):
+    def size_function(t):
+        return math.sin(t) * factor + min_size
+
+    return size_function
+
+
 def create():
     g = Group().pos(400, 300)
-    Circle(g).radius(300).color(Color.BLACK).z(1)
-    Circle(g).radius(290).color(Color.BROWN).z(10)
+    Circle(g).color(Color.BLACK).z(1).animate("radius", size_func_factory(260, 50))
+    Circle(g).z(10).animate("color", color_func).animate(
+        "radius", size_func_factory(250, 50)
+    )
     Circle(g).radius(20).color(Color.BLACK).z(50)
-    Line(g).vec(lambda: time.time() % 60 / 60 * 360, 200).z(100)
+    # Line(g).vec(
+    #     lambda: time.time() % 60 / 60 * 360,
+    #     200
+    # ).z(100)
+
+    l = Line(g).vec(0, 200).z(100).animate("degrees", lambda t: t % 60 / 60 * 360)
+    # l.animate("color", color_func)
diff --git a/src/doodles/examples/liskov.py b/src/doodles/examples/liskov.py
new file mode 100644
index 0000000..6d2ecab
--- /dev/null
+++ b/src/doodles/examples/liskov.py
@@ -0,0 +1,25 @@
+"""
+Demo of the interchangable nature of these classes.
+"""
+from doodles import Polygon, Line, Rectangle, Circle, Color
+import random
+import math
+
+types = [Polygon, Line, Rectangle, Circle]
+
+
+def rainbow(t) -> tuple[int, int, int]:
+    """cycles through colors based on time"""
+    t = t % 1.0
+
+    r = int(255 * (1 + math.sin(2 * math.pi * (t + 0.0 / 3))) / 2)
+    g = int(255 * (1 + math.sin(2 * math.pi * (t + 1.0 / 3))) / 2)
+    b = int(255 * (1 + math.sin(2 * math.pi * (t + 2.0 / 3))) / 2)
+
+    return (r, g, b)
+
+
+def create():
+    for _ in range(100):
+        DoodleType = random.choice(types)
+        doodle = DoodleType().random().animate("color", rainbow)
diff --git a/src/doodles/examples/polygons.py b/src/doodles/examples/polygons.py
new file mode 100644
index 0000000..6430b27
--- /dev/null
+++ b/src/doodles/examples/polygons.py
@@ -0,0 +1,19 @@
+from doodles import Polygon, Color
+import random
+
+
+def new_point(t):
+    return (random.random() * 100 - 50, random.random() * 100 - 50)
+
+
+def create():
+    for _ in range(5):
+        p = Polygon().random(3)
+        for pt in range(3):
+            p.animate("point", new_point, to_modify=pt)
+        p = Polygon().random(8)
+        for pt in range(8):
+            p.animate("point", new_point, to_modify=pt)
+        p = Polygon().random(100)
+        for pt in range(100):
+            p.animate("point", new_point, to_modify=pt)
diff --git a/src/doodles/lines.py b/src/doodles/lines.py
index 66bc4db..623c276 100644
--- a/src/doodles/lines.py
+++ b/src/doodles/lines.py
@@ -63,7 +63,7 @@ class Line(Doodle):
         self._offset_vec = (x, y)
         return self
 
-    def vec(self, degrees: float | Callable, magnitude: float):
+    def vec(self, degrees: float, magnitude: float):
         """
         Alternate setter, to create offset vector from angle & length.
 
@@ -72,14 +72,16 @@ class Line(Doodle):
         directly (`to`), but there is also an alternate option
         that handles commonly used case.
         """
-        if callable(degrees):
-            self.register_update(
-                self.to,
-                lambda: magnitude * math.cos(math.radians(degrees())),
-                lambda: magnitude * math.sin(math.radians(degrees())),
-            )
-            return self
+        return self.to(
+            magnitude * math.cos(math.radians(degrees)),
+            magnitude * math.sin(math.radians(degrees)),
+        )
 
+    def degrees(self, degrees: float):
+        """
+        Alternate setter, like calling vec(new_degrees, old_magnitude).
+        """
+        magnitude = math.sqrt(self._offset_vec[0] ** 2 + self._offset_vec[1] ** 2)
         return self.to(
             magnitude * math.cos(math.radians(degrees)),
             magnitude * math.sin(math.radians(degrees)),
diff --git a/src/doodles/shapes.py b/src/doodles/shapes.py
index 1a4c5be..3fb6e96 100644
--- a/src/doodles/shapes.py
+++ b/src/doodles/shapes.py
@@ -5,7 +5,7 @@ these classes only differ from `Line` in implementation.
 The interface & decisions are the same but specific
 to `Circle` and `Rectangle`.
 """
-from typing import Self
+from typing import Self, Optional
 import random
 from .doodles import Doodle
 from .world import world
@@ -86,3 +86,48 @@ class Rectangle(Doodle):
         return self.width(random.random() * size + 10).height(
             random.random() * size + 10
         )
+
+
+class Polygon(Doodle):
+    """
+    All points are *relative* to the center point.
+    That is to say, if you had a triangle with coordinates:
+
+        (100, 100)
+        (0, 100)
+        (-100, 0)
+
+    And the object was moved to (50, 50), the actual triangle drawn
+    on screen would be:
+
+        (150, 150)
+        (50, 150)
+        (50, 50)
+    """
+
+    _points: list[tuple[float, float]]
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self._points = []
+
+    def __repr__(self):
+        return f"Polygon(pos={self.world_vec}, points={self._points})"
+
+    def draw(self):
+        world.draw_engine.polygon_draw(self)
+
+    def point(
+        self, point: tuple[float, float], to_modify: Optional[int] = None
+    ) -> Self:
+        if to_modify is not None:
+            self._points[to_modify] = point
+        else:
+            self._points.append(point)
+        return self
+
+    def random(self, n_points: int = 5) -> Self:
+        super().random()
+        for _ in range(n_points):
+            self.point((random.random() * 100 - 50, random.random() * 100 - 50))
+        return self
diff --git a/src/doodles/world.py b/src/doodles/world.py
index f02f144..9b43d9a 100644
--- a/src/doodles/world.py
+++ b/src/doodles/world.py
@@ -90,6 +90,12 @@ class PygameDrawEngine(DrawEngine):
     def line_draw(self, ll: "Line"):
         pygame.draw.aaline(self.buffer, ll.rgba, ll.world_vec, ll.end_vec)
 
+    def polygon_draw(self, p: "Polygon"):
+        # calculate offset points from center of world
+        offset_points = [(x + p.world_x, y + p.world_y) for (x, y) in p._points]
+        # draw using anti-aliased lines
+        pygame.draw.aalines(self.buffer, p.rgba, closed=True, points=offset_points)
+
     # TODO: hard to type, revisit
     def text_render(self, text: str, font, color: tuple[int, int, int]):
         """returns an intermediated RenderedText"""