A more thorough explanation:

Definition: Jactus lapilli is a Latin term that means "the throwing down of a stone." In Roman law, it refers to a landowner's act of throwing a small stone onto a neighbor's land to symbolically protest construction that could threaten the thrower's interest. It is similar to novi operis nuntiatio, which is a formal notice of protest against a neighbor's construction.

Example: If a landowner is concerned that their neighbor's construction project will damage their property, they may perform a jactus lapilli by throwing a small stone onto the neighbor's land. This act serves as a symbolic protest against the construction and a warning to the neighbor that the landowner is watching closely.

Explanation: The act of jactus lapilli is a way for landowners to express their concerns about potential property damage without resorting to legal action. By throwing a small stone onto their neighbor's land, they are sending a message that they are aware of the construction and will take action if necessary. This act is symbolic and does not cause any actual damage, but it serves as a warning to the neighbor to proceed with caution.