There are few joys quite like turning an everyday sidewalk into a gaping cave cascading with rainbow waterfalls. To achieve such an uncanny phenomenon, you can either experiment with some seriously hallucinogenic substances, or stumble across the visual treasure trove that is three-dimensional chalk art.

In the past few years the grassroots art form of 3D chalk has become a medium to be reckoned with. As the visual amalgamation of optical illusions, hyperrealism and public street art, the accessible technique appeals to pretty much everyone. Aside from its hypnotic affect and impressive technique, chalk art rules because the subject matter can truly be anything. Take a look at our roundup below, which includes everything from a giant snail to a game of Pac-Man. Just try and tell us this isn't the most democratic, and psychedelic, art form out there.