Cyanobacteria exist in many environments, which include terrestrial, freshwater, and marine habitats. They play a vital role as carbon dioxide consumers and oxygen producers in oceans. A recent study on Synechocystis, a species of cyanobacteria, has shown that these bacteria have the ability to actually see light. This is vital to the metabolism of the Synechocystis because they need light from the sun to produce energy. Synechocystis' bodies functions as lenses. When light hits a point on the spherical end of their unicellular bodies, it refracts to the opposite side of their bodies. The cyanobacteria grow pili to adhere to surfaces and move toward the light. They are able to position themselves in a location where light conditions are optimal,