Hugh Hayden’s Tennis Ball Chair binds roughly 300 recycled tennis balls into a hexagonal grid with non-stretch polyester cord. Made around 2008 as part of his FUNATURE series, Hayden — a Dallas-born, Cornell-trained architect turned sculptor — sourced used balls from New York tennis clubs to keep them out of landfills. Packed tight, they become dense, bouncy upholstery that is as funny as it is practical. Better yet, it’s proof that green design doesn’t have to look so green.

Make it “optic yellow” instead. After all, the tennis ball is shorthand for an entire aesthetic now: country clubs and concrete courts, ALD lookbooks and Challengers screenshots, Sunday morning rallies in public parks. Over 300 million get manufactured every year. Almost none biodegrade. They lose their bounce in hours and end up in hoppers, dog parks, garage buckets. Hayden’s chair takes the most disposable thing in the game and makes it worth sitting with — whether you’re playing or just watching.