Cheap material and decommissioned industrial stuff: We posted a lot of examples of what Repurposed Materials, "America's largest industrial thrift store," sells.
AT&T and Gallaudet University have developed an AR football helmet. It allows deaf players to see plays "called" by the coach.
Interior designer turned illustrator Iñaki Aliste Lizarralde creates detailed floorplans of homes from famous TV shows. He's collected them in a book, "Behind the Screens."
This vintage dimmable lamp is actually by cosmetics brand Shiseido. They didn't have a lighting division, so I'm guessing it was made as a promotional item.
Water and light artist Lachlan Turczan devised this impressive piece. Can you figure out how he did it? The answer's here.