One night I invented infinity goggles, and when I searched the next morning I found out someone else had just published some as a project. I came up with the speaker goggles because I wanted to do something dumb enough that no one else had done it before. Built from a Bluetooth receiver, a class-D amp, two drivers, a switch, and a battery. I sourced the drivers online, afraid I’d have to order a dozen pairs before I found the right ones, and was ecstatic when they actually fit. The goggles themselves were the most expensive component. You can wear them in front of your eyes, not that you’d ever want to.