New York-based artist Joe Mangrum has spent the last 8 years drawing beautiful, hypnotic patterns and designs on the streets and squares of New York. But chances are you probably won’t see any of them, because they tend to disappear.

Mangrum draws his impressive and expansive works by pouring brightly-colored sand from his hands. The circular geometric forms he uses, as well as his use of colored sand, makes his work resemble traditional Buddhist mandalas, but he also mixed in marine biological design elements and other to give his work a unique look. The artist writes that his “paintings are influenced by an abundant world of undersea creatures, carnivorous plants emanating electrical impulses,… [and] cross-cultural metaphors from many years of travels around the world.”