KOZ Architects’ Sports & Leisure Center is a rainbow colored wonderland for kids in Saint-Cloud, France. Designed for festive celebrations and entertainment and featuring the ‘coolest’ indoor climbing wall in France, the vibrant hues from the outside of the building correlate via color coding to the interior areas — enabling spatial orientation for young children. Environmentally aware KOZ architects made ‘green’ the standout color in their project by implementing eco-aspects into their design. The openings in the roofs and the glass facades allow for maximum natural lighting and limit electrical consumption, and they used prefab concrete slabs to reduce waste, pigment infused concrete to reduce paint use, and installed a solar heated hot water system.