Spheroids or microtissues are used in biotechnology and pharmaceutical industries as 3D cell cultures for drug development or toxicology. It could also represent a small solid tumor tissue. Or it is an early embryo in a stage after the first couple of cell divisions. Single object. A project file made in Cinema4D-R20 with lights and procedural materials is included to produce the thumbnail image (pink) using the built-in physical render engine. The C4D-project uses an included small hdr-image for improving the illumination. The other formats contain only the spheroid object.