It's a 3D chart serialized on to 2D. Look at one of the corners, then go to the opposite one. Repeat twice more. The fact that this approach is basically fundamentally geometrically unsound doesn't help the chart's coherence. (Unless they really are claiming that these three things are in fact dependent on each other in exactly the way the 2 dimensionalization of the chart implies, which I doubt.)

Take the test: http://www.okcupid.com/tests/the-polygon-test

From the description:

This test will track three variables, but you may be surprised at what they are.

"...but I'm willing to learn."

Don't do that, please.

Sometimes charts are bad.

Nothing to do with data, or the potential learning of data.

FFS.