No idea, but would idly speculate it could be related to the effect seen in bees, where stripes could be used to fool them into thinking the ground was closer o

No idea, but would idly speculate it could be related to the effect seen in bees, where stripes could be used to fool them into thinking the ground was closer or further away: http://www.ncbi.nlm.nih.gov/pubmed/22915710 http://www.ncbi.nlm.nih.gov/pubmed/22915710