A microscope can make even the most familiar objects look unrecognizable. Up close, the things we see every day can appear completely foreign. To see this principle in action, Lenstore.co.uk (which has previously created other impressive hidden image puzzles and optical illusions) created the quiz below, which gives you 30 seconds to figure out what the object is pictured in each extreme close-up photo. Think you can tell the difference between a book, a harp, wheel spokes, and an air filter? Trust us, it’s harder than it sounds.