diff --git a/interactions.py b/interactions.py
index a002dc7..ea14c44 100644
--- a/interactions.py
+++ b/interactions.py
@@ -10,7 +10,7 @@ import phue, pygame, colorsys
 viewsize = 600
 shrink = 0.9
 vertices = [(viewsize*(1 + shrink*x)/2, viewsize*(1 + shrink*y)/2) for x, y in
-  [(0, 0)] + [(cos(-n*pi/5), sin(-n*pi/5)) for n in range(10)] + [(0, 0)]
+  [(0, 0)] + [(sin(n*pi/5), -cos(n*pi/5)) for n in range(10)] + [(0, 0)]
 ]
 
 # edges as vertex pairs. FireStar will rest on vertices 6 (A), 5 (B), 7 (C)