it make sense from an adaptation standpoint, hair that could only settle in one direction would make it hard for them to move forward and back in their lil' mole tunnels. I suspect they evolved a solution to the chafing that would cause.
I found it clever that ephrin noticed that the last name of the artist happened to be Venn, and called out the picture correctly as a Venn diagram, as in a diagram made by Venn.
Add to that I spent a measurable fraction of a minute searching for the hidden overlapping circles only to eventually discover the pun, I was amused and thought others might have appreciated it more than the paltry 8 up votes received.
