<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body dir="ltr" bgcolor="#ffffff" text="#000000"> I mean, in graphic design/visual art, not in mathematics. Is it limited to color? 3 samples: <a class="moz-txt-link-freetext" href="http://www.selapa.net/create/">http://www.selapa.net/create/</a> Do you think these are gradients, why? </body> </html>