I don't know who the artists are, if anyone knows, inform me and I will credit.

A number appear to be the work of Gerlach and Martin Gerlach jnr 

(Cheers to Chris Bond)

M C Escher (1898 -1972)

http://www.mcescher.com/

http://en.wikipedia.org/wiki/Giuseppe_Arcimboldo

http://pintura.aut.org/

© Jorge Enrique Molgora

© Octavio Ocampo

To see many more optical illusion artworks - http://www.facebook.com/group.php?gid=57353637008

With Special Thanks to Maya Prieto

see also  -  http://beautiful-grotesque.posterous.com/the-illusion-of-life-in-death-istvan-orosz-an

© Thomas Woodruff

To see many more optical illusion artworks - http://www.facebook.com/group.php?gid=57353637008 

With Special Thanks to Maya Prieto.

see also http://beautiful-grotesque.posterous.com/the-illusion-of-life-in-death-istvan-orosz-an