Erik Brandal has made an electronic sound sculpture which generates square waves. So in a sense it’s a drone sculpture within a beautiful, intricate case. Here’s more from hackaday:
The heart of this sculpture is an ESP32. It’s used to generate square waves, as well as to control the filter, amplitude, echo effect and LEDs. For once I made a video of the entire building process so that I don’t have to write too much. The video itself covers everything from design, preparing the materials and soldering.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.