bluesnake462 s-t-r-a-n-g-e-c-h-a-r-m The Chalk Twins are a duo of sister artists and the go to Cons and make giant chalk pastel murals that are auctioned off throughout the Con.This one is from MegaCon 2014. I never got a completed shot but clearly it was awesome. Source: s-t-r-a-n-g-e-c-h-a-r-m