Frank Lloyd Wright was an architect who loved to design every detail of the houses he built, including decorative stained glass windows. The sunlight coming through Wright’s windows casts colorful light patterns inside the house. The colors and shapes change throughout the day, and in each season, according to the position of the sun. This window was made for a schoolroom and playhouse for young children. The red and blue blocks are confetti thrown in a parade. What are the circles?