The SANDBOX Manifesto outlines 10 principles for play and creativity. It encourages sharing, embracing messiness, using imagination, filling buckets with sand, spreading hugs and smiles, taking play to the community, seeing strangers as future friends, being remarkable, being the master of one's own universe, and recognizing that play is important work. The overall message is that play should be life-changing, problem-solving, collaborative, innovative, and create community through imagination in a sandbox setting.