TULIPS (Tool for Understanding the Lives, Interiors, and Physics of Stars) creates diagrams of the structure and evolution of stars. It creates plots and movies based on output from the MESA stellar evolution code (ascl:1010.083). TULIPS represents stars as circles of varying size and color. The code can also visualize the size and perceived color of stars, their interior mixing and nuclear burning processes, their chemical composition, and can compare different MESA models.