is been a while, but the Beach is basically "the other side"; the game's version of the afterlife.
DOOMS is a person's connection to the Beach/those ghost things - the higher your level of Dooms, the more you can detect and even have some level of influence over them.
iirc, Amelie is on the Beach, but she can send a projection of herself to the "real world".
Don't you agree, Zach?
https://streamable.com/ueacaz