diff --git a/erynrl/engine.py b/erynrl/engine.py
index 4a9de14..aa628d4 100644
--- a/erynrl/engine.py
+++ b/erynrl/engine.py
@@ -86,7 +86,7 @@ class Engine:
         self.update_field_of_view()
 
         # Interface elements
-        self.hit_points_bar = Bar(position=Point(4, 45), width=20)
+        self.hit_points_bar = Bar(position=Point(4, 45), width=20, colors=list(color.HealthBar.bar_colors()))
 
         self.message_log.add_message('Greetings adventurer!', fg=(127, 127, 255), stack=False)
 
diff --git a/erynrl/interface/color.py b/erynrl/interface/color.py
index 3dfd44f..3e87d46 100644
--- a/erynrl/interface/color.py
+++ b/erynrl/interface/color.py
@@ -1,10 +1,45 @@
 # Eryn Wells <eryn@erynwells.me>
+# pylint: disable=too-few-public-methods
 
 '''
 A bunch of colors.
 '''
 
-BLACK = (0, 0, 0)
-WHITE = (255, 255, 255)
-GREY10 = (26, 26, 26)
-GREY50 = (128, 128, 128)
\ No newline at end of file
+from typing import Iterator, Tuple
+
+Color = Tuple[int, int, int]
+
+# Grayscale
+BLACK = (0x00, 0x00, 0x00)
+GREY12 = (0x20, 0x20, 0x20)
+GREY25 = (0x40, 0x40, 0x40)
+GREY50 = (0x80, 0x80, 0x80)
+GREY75 = (0xC0, 0xC0, 0xC0)
+WHITE = (0xFF, 0xFF, 0xFF)
+
+# Primaries
+BLUE = (0x00, 0x00, 0xFF)
+CYAN = (0x00, 0xFF, 0xFF)
+GREEN = (0x00, 0xFF, 0x00)
+MAGENTA = (0xFF, 0x00, 0xFF)
+RED = (0xFF, 0x00, 0x00)
+YELLOW = (0xFF, 0xFF, 0x00)
+ORANGE = (0xFF, 0x77, 0x00)
+
+# Semantic
+class HealthBar:
+    '''Semantic colors for the health bar'''
+    FULL = GREEN
+    GOOD = GREEN
+    OKAY = YELLOW
+    LOW = ORANGE
+    CRITICAL = RED
+
+    @staticmethod
+    def bar_colors() -> Iterator[Tuple[float, Color]]:
+        '''Return an iterator of colors that a Bar class can use'''
+        yield (0.1, HealthBar.CRITICAL)
+        yield (0.25, HealthBar.LOW)
+        yield (0.75, HealthBar.OKAY)
+        yield (0.9, HealthBar.GOOD)
+        yield (1.0, HealthBar.FULL)
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