A Sound-Reactive Infinity Mirror

If you’ve ever stood in a gym or dressing room and marveled at the way your reflection seems to stretch to infinity, then you’ve experienced the phenomenon behind infinity mirrors. Mirror setups that are actually designed for people outside to observe this “infinite” effect replace at least one normal reflecting mirror with a one-way mirror, allowing onlookers to gaze inside this repeating light pattern, while still preserving its ability to bounce light.

This particular mirror hack involves creating a one-way mirror by sticking window film to one side of a cut piece of glass, then attaching it to a custom box. On the back of this is a normal mirror, as no one will be looking from that direction. Inside of the two devices is a strip of programmable WS2813 lights wrapped around the perimeter.

An Arduino Uno is used for control, though it’s noted that other boards could be implemented. It takes input from a tablet app written using MIT’s App Inventor 2 to adjust the light’s brightness and color, and even features a sound sensor module, enabling the LEDs to light up depending on the surrounding light intensity.

Be sure to check it out in action below, or see the entire project write-up for detailed instructions, along with Arduino and app code.