Module is a 1U tile
This Module is currently available.
Solar Theremin CV Controller
https://www.errorinstruments.com/a-72194746/new-on-error-eurorack-and-more-welcom/1u-solar-theremin/#description
These merchants probably sell this module. Huh?
Included in 28 Racks, 11 are public:
errorinstruments Error Instruments