Friday Puzzler -- Rope Coils
Alex Y
This isn't really a puzzle, but rather a challenge.
Below are pictures of two coils of rope. One is a single rope with its ends joined. The other picture is actually two ropes intertwined, each with its ends joined. The challenge is to determine which is which, using your eyes only. No tracing with your fingers, drawing on your monitor with a sharpie, etc. 
