The word joy comes from the same root as the word rejoice, so celebration is inherent in the concept of joy. When we come together to share good news, the result is a kind of communal joy that is larger than the sum of its parts. Joy spreads infectiously through laughter, music, dance, and the upswept, open-armed gestures of merrymaking. We can harness this festive joy with aesthetic elements that amplify the effervescent, dynamic qualities of our natural expressions of joy: bursting shapes like those of fireworks and starbursts, sparkling lights and glittering materials that scatter light, and strong rhythms that unite a group in synchronized song or movement.