I am sure cats can de-materialize and materialize again. When my Mom was catsitting, I told her that Filou would vansih somewhere in the apartment and in the moment of her total despair would sit in the middle of the room saying "What's this fuzz all about?" in an indignated way.
When it happened to her she had forgotten and asked all the neighbors whether they had seen him and of course, after some hours, there he was, in the middle of the living room....
(I never find middens - so this is a proof that he was in some other world...)