Neko Atsume has plenty of cube shaped beds for cats to use. This one is the Tiramisu Cube. This item does not attract any of the rare cats. Many of the other Neko Atsume cats will use it.
The Tiramisu Cube flavor text says: “Indulge your cats lounging instincts with this decadent tiramisu-themed hammock cube.” It costs 28 gold fish in the Neko Atsume store.