For the last few years, [Cristiano Monteiro] has marked March 14th by building a device to calculate Pi. This year, he’s combined an RP2040 development board and a beam-splitting prism to create an otherworldly numerical display inspired by the classic Pepper’s Ghost illusion.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/14/celebrating-pi-day-with-a-ghostly-calculator/