This playground eschews “playing it safe” and creates unique physical and sensory experiences where children can interact, create, and imagine. The playground’s owner – a small private school, pre-k to 8th grade – believes they have an educational, and even moral, imperative to restore, as best a school can, unstructured free play to the long days that children spend studying and learning, mostly indoors. The playground contains an undulating ground and “ribbon” made of two continuous tubes with a net stretched between them culminating in a small amphitheater. Four play-based principles informed the design. Principle 1 – climbing – supports coordination and power, problem solving, and imagery and visualization. Principle 2 – overhead play – increases core body strength, hand-eye coordination, and upper body skills. Principle 3 – swinging – promotes dramatic imagination, cooperation and sharing, and sensory stimulation and stress reduction. Principle 4 – collaborative space –provides possibilities for group learning in spaces such as the amphitheater classroom. To save water, substantial dollars, and avoid the need to obtain a building permit, all rainwater is sequestered on site in an underground gravel “sponge” located below the playground’s resilient (orange/red) surface. Once rain permeates through the surface, it seeps into an extensive underground sand layer, which naturally draws water back to Lake Michigan.