Professionally printed on firm, textured mat boards perfect for desks and shelves. Supplied with 3M velcro dots to easily affix to walls. Available in standard sizes. "CHALLENGE WINNER in Rainbow of Colors in Art":wormy squirmy tubes, mezmirizing and vivid, optical art (op art), ink and colored pencil by Nalinne Jones. Here's a time lapse of a similar one I did with darker colors, called "Nightcrawlers" found an amazing and easy tutorial on how to make the tubes on StumbleUpon, then colored…