First life externality
A dish washer that has been trashed with clothes still inside. One of the critical externalities of the our techno-material world... one hour later in the night the device has been removed... soon to be hijacked by silent and tech-savy wizards who operate at the heart of our cities.
Pay attention to these artifacts on the street... In this case the engine might very well be used soon for quite different purposes (like those people ripping off steal/metal parts and selling them).