A Spirogyra is a tiny colony of algae this is typically found in the ocean. In the game Everything, it can be found at the bottom of a Green Planet's ocean. It appears to have the ability to split, so the average size is listed.
The oceans of Green Planet .
The spirogyra appears quite accurate to its size in real life, except that some strands can grow up to a few centimeters in size! It also appears like it does in real life, except for the fact that it looks hollow in the middle in the game.