The video shows a first-person view of a player in Minecraft placing blocks and activating a mechanism. The player places a block with a pattern on it, followed by a lever, and then activates the lever. This causes a chain reaction where a series of blocks are pushed and pulled, creating a domino effect. The player then repeats the process, placing more blocks and activating the lever, continuing the chain reaction. The video ends with the player looking at the completed chain reaction.