Feather block

Or Block of feathers. Crafted from 9 feathers. Saves from damage when falling. If the height could cause damage, the player falls through it and the block emits particles.

Can be used to create hidden vertical passages.

In addition to the idea I propose to add physics to it, like sand, cement or gravel, but for it to fall slower. Or that the player could stand on it and slowly descend on it. When falling, the block breaks down and drops out as a drop of feathers with particles.