[rhoalt] had neither, but he did have several 8 LED Neopixel rings lying around ... clock which uses the Neopixel rings as 7 segment displays. Each digit is made using one pair of Neopixel ...

What do you do with 144 7-segment displays ... hand-coded lookup tables for each digit. The lookup tables are stored in ROM, saving precious RAM on the Arduino. A clock wouldn’t be any good ...