gotta love this sampler of inky ZenTangle type stuff. I love zen tangling!
How to Draw an Impossible Square Illusion - http://www.moillusions.com/how-to-draw-an-impossible-square-illusion/
Op Art Letter Fabric Panels for DIY projects: Pillows, Curtains, Quilts
This would make an amazing quilt design - Artist Victor Vasarely
Optical Allusions by Graphic Nothing
Rainbow stained glass star perler bead pattern or cross stitch
Christiane Wyler an artist, painter and designer she's painted on silk using mixed media like textured surfaces to combine colour. she say colour is life.
animation GIF - Swirling Sheets - For more beautiful images and interesting posts, checkout DesignStack.
This is so amazing! Pattern named: "the-crows-nest", by Dylan Fisher. To Observe the Crows Flying . move the pinned picture of the nest up and down a bit with your arrow key . it looks as if it could fly away. Observe the Pattern!
From a book or print Black and White / pattern design / optical art / Lined