I've seen numerous infinity mirrors and always liked the effect. However, I've never seen a really small one. I had recently purchased a new type of resin and wanted to try it out. What popped into my head was the infinity mirror pendant. The main challenge would be to create an infinity mirror small enough to fit in a pendant. The infinity mirror is composed of a mirror, lights, and a one-way mirror. The square bezel for the pendant had an interior depth of roughly 5 mm (3/16 of an inch). I would have to find LEDs that were small enough to fit while making sure they were low voltage (as I wanted to minimize the size of the required battery). Without LEDs small enough, this project would be over before it started. On a trip to the electronics shop, I found some LEDs that looked like they would fit and after purchasing a few more electronics components, it was time to start.
I initially intended to do only a square pendant but mid-way through the project, I decided to try making a round one as well. The results weren't bad for a first attempt. Not great but not bad. And definitely serves as a decent proof-of-concept.