This MasterPieces 21" x 15" 500PC Brilliance Puzzle captures the brilliance of life. "Fall Frenzy" features an exciting frenzy of fall leaves. Temperature, light, and water supply have an influence on the degree and duration of fall leaf color. Low temperatures above freezing promote anthocyanin formation, producing bright red leaves; however, early frost will weaken the brilliant red coloring. Rainy or overcast days tend to increase the intensity of fall colors. To reduce its impact on our environment, the chipboard used in this puzzle is made of recycled material.