The Meaning of Life, the Universe, and Everything.
Lying on my Couch <3
Lying on my Couch =(^-^)=
Block states can do this, the top most thing.
It uses the states of a block, the block can have, but can not use states of other block's states, fe. stairs can go in any 4 directions and be upside down, but cobblestone can only use blank. (literally nothing)
Even though blocks can't use other block's states, they all can use blank, except barrier and air.