+Halle's Magnetically-Mated Concert Chair (opens in new tab)

This stacking Concert Chair is by Canadian industrial designer Jamie Wolfond. It has magnets along its sides, allowing it to perform a visual trick when placed alongside its mates:"The chair owes its unconventional form to a half round profile which forms its entire structure," Wolfond writes. "When put side-by-side, these profiles form a complete circle, creating the impression of a single circular leg.""A row of Concert chairs becomes a tidy and unified object, lending itself to gathering, ...