19 Fantastic Optical Illusions for maths and science centers, warm ups, or just for fun. Great for kids, and just as much fun for adults too. Try one now for yourself ! The Download• 19 Optical illusions - 1 per page• Student quiz sheet• Teachers answer key• All pages are in landscape format for projectors / screens• Clip art - 19 black and white png files at 300dpi• All graphics are digitally drawn by myself to give you crisp clean imagesOptical illusions featured• Ponzo illusion• Kanizsa trian