Etch A Sketch®

Ron Morse (etcha)

Etch-a-sketch imposible triangle

A Reutersvärd's version of impossible triangle was created by Etch-a-sketch artist from Portland (USA) Ron Morse (etcha)

Artist's Flickr profile http://www.flickr.com/people/etcha

Image source http://www.flickr.com/photos/etcha/2197825031/