Another shot at these spherical algae colonies, this time using a blue background. All of these were done with my camera and the Raynox macro conversion lens attached - no microscope. The mother spheres are composed of hundreds to thousands of microscopic green algae holding together. They form daughter colonies in their hollow center which are released when the mother colony bursts. These organisms are an intermediate between colonies of individual cells that can survive on their own and multicellular organisms with different tissues and specialized cell types. Already you can see cells specializing in these colonies, some for reproduction, some for sensing light, some for motility etc.