The arms are made from Lego bricks, held up with rubber bands and actuated with two servos mounted on a cutting board. To detect Simon’s lights, [Ben] connected four phototransistors to an Arduino.

LEGO bricks have the potential to last for up to 1,300 years if they end up in Earth’s oceans. The plastic toys are incredibly durable, but that makes them an absolute nightmare when it comes to ...