Not exactly chromostereopsis, but it must rely partly on the effect: http://www.cs.toronto.edu/~moraes/illusion.html The image is *not* animated. Regards, William Hudson Syntagm Ltd Design for Usability US Toll Free 1-866-SYNTAGM UK 01235-522859 World +44-1235-522859 mailto:[log in to unmask] http://www.syntagm.co.uk http://www.designforusability.com