Why it belongs. Horsea is stretched out with its snout resting on top of a Shellder and its eyes shut tight, completely content. Shellder is much less thrilled. It’s glaring out from under its shell with its tongue sticking out and a sweat drop on its brow, clearly aware it has been turned into a pillow and clearly unable to do anything about it. Behind them are swaying seaweed, a few rocks and a bubble trail drifting up, so the whole scene feels like a calm, slightly comic corner of the seafloor.