Chet Callahan cares for his son full time and he says his child is fascinated by the highly contrasting geometric shapes of the animals.

Chet Callahan, a stay at home father said, "In the beginning, we would just line the crib with the flash cards and he could be entertained for minutes, which is a big deal for an infant."

The removable decals are self-adhesive and peel-and-stick. And they are made specially for transferring onto glass, porcelain and other spaces.

(CCTV April 29, 2009)