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These mind-bending optical illusions will make you wonder if you smoked more than you thought.

Are your eyes playing tricks on you, or did you unknowingly (or knowingly) smoke too much weed? Stoners’ Optical Illusions contains more than 150 colorful and mind-bending illustrations—such as moving lines, wriggling shapes, and hidden 3-D images—done in a weedy theme to make you feel tripped out every time you turn the page. Each optical illusion includes an explanation of how and why it makes your head spin, breaking down the science into basic concepts that every stoner can grasp.