About two months ago, Portland’s bomb squad detonated a suspicious tennis ball. This time around, they investigated the contraption above, which they randomly saw on the street. This led to roads being shut down for an hour while police carefully inspected the object.

Surely, you’re all wondering what the object is. Well, it’s a “makeshift diorama containing a packet of tomato seeds, a flannel shirt and a computer mouse.” Eventually, they dismissed this First Grade project as harmless and left it where they found it.

But who left it there?

[via Gawker]