1.17 The Living Cave

This cave would be part of the 1.17 update and would seem alive. The cave would have many cave tunnels that are blocked off by alternating blocks. The alt blocks would act as a "chain" when 2 or more are touching each other. The chain would alternate between its air phase, and its solid phase. This would make it seem like a labyrinth, because some chains could be closed, but others could be open. The chain should take around 40 seconds in each phase. The cave likes it when its dark and quiet, so you should keep it dark and quiet or it might not like you. You shouldn't really have to worry about keeping it quiet unless you run, jump, place blocks around etc. It also hates light source blocks as well as noise, so don't place any torches! If you remain quiet and only rely on natural light, the cave could be happy with you, and when its happy, the natural lights within the cave could glow brighter, and the alternating blocks could last longer in their air state. If its unhappy with you, mobs could spawn more frequently as well as bats, and alternating blocks could last longer in their solid state.