Artful illusions : designs to fool your eyes

Aki Nurosi and Mark Shulman, the authors of "Colourful Illusions", are back to play more astonishing visual tricks.

These exquisitely designed brain-bending, mind-blowing, all-colour optical illusions will really fool your eyes.

Each is a masterpiece of design and puzzlement - created to appeal to wide-eyed children, design students and art lovers: watch forms take shape; see lines curve and bend; make two-dimensional objects become 3-D; and try to figure out what is real - and what isn't.