People have been making art out of algae since the 1800s. Today English artist Klaus Kemp (klows kemp) experiments with this obscure art form. He collects the glass-like shells of single-celled organisms, called diatoms, in shallow bodies of water. They are tiny—most between 0.005 and 0.2 millimeters—and come in many different shapes. Kemp cleans them, arranges them in intricate patterns on a glass slide, and glues them into place. The finished works are so tiny that they must be viewed through a microscope!