If you're a fan of both mind-bending substances and mind-bending illusions, then blaze your way through the trippy illustrations inside Stoner's Optical Illusions.

There might not be 420, but there are still more than 100 marijuana-themed artworks inside that will make you wonder if you've smoked just a little too much. From pulsating patterns to bizarrely impossible shapes – not to mention spliffs that you could have sworn were longer a minute ago – this book will make your brain tingle before it blows your mind. Isn't that dope?