This is what is known as a “Living Ghost Crystal”

A Living Ghost Crystal is a type of crystal that Living Ghost can go into, it’s recently become a fashion statement in Andromeda, even Prince Kenshin and Princess Cataclysma have been including these strange crystals into their outfits, and they are known to change color depending on who is in the crystal (for example Ghostie’s color would be baby blue)

So basically a prison for living ghosts.

Not really, they can go on and out as they please

In*

Oh oke

It’s basically a way for characters who are living ghosts now to be able to tag along with other characters and still be relevant

*building/house

So inkmatas would probably be green or red

she would be yellow green

These are the current colors of Living Ghost crystals