There is a lantern on top of a knife in the dirt. You walk up to take the knife and lantern when you realize it's just a model. It all looked real from far away, but now that you're up close you can see none of it is real.
You touch the model and see that it's made of cake (けい)! Someone really into lanterns and knives must have been given this model cake as a birthday present! Though they left it out here so they probably didn't like it.