If you think that you’re immune from sun damage because your skin doesn’t look harmed, then you might want to watch this video.

New York-based artist Thomas Leveritt challenged by-passers to stand in front of an ultraviolet camera, revealing the seemingly invisible changes that had already taken place on their skin.

The revelations are shocking—especially seeing how effective sunscreen is at blocking UV rays. If this doesn’t inspire you to slap on some sunscreen before you head outside, then nothing will.