Push-Block

Push-Blocks are Bomp-like protruding platforms that appear in the Cap Kingdom in Super Mario Odyssey. They constantly alternate between moving inwards and outwards from the wall, and are used both as pushing obstacles and as platforms. Two appear along the top of Top-Hat Tower, leading to a platform with a door to a large secret area, itself full of Push-Blocks. Despite being called blocks, they are not all rectangular; one in particular is somewhat L-shaped, and has an alcove with a hidden Power Moon in it.