When I saw the post, I immediately remembered this! I saw it the first time when I was about 14 y/o, it inspired me to learn a bit about logic and EE, such as

When I saw the post, I immediately remembered this! I saw it the first time when I was about 14 y/o, it inspired me to learn a bit about logic and EE, such as how can we build an AND block of relays, and how these blocks are connected together. Eh, good memories, thanks for sharing :)