Percy Jackson and the Olympians: Legends

Poseidon's Cabin is the cabin that houses the demigod offspring of Poseidon. Poseidon's cabin is low, long and solid, with all the windows facing the sea. The outer walls are rough gray stone with pieces of seashell and coral and look like the bottom of the ocean floor. On the inside, it has six empty bunk beds and the walls glow like abalone. Tyson later adds a few bronze hippocampi on the ceiling as decorations, along with unknown underwater plants and corals, sitting in the window sill, "more beautiful than the Demeter kids could whip up." When he moves into the cabin, Percy hangs his Minotaur's Horn up on the wall which is Percy's first spoil of war collected and his only possession at the time aside from a toiletries bag and a set of spare clothes. It is mentioned to still hang there and it presumably still continues to hang in the cabin.