Some crimes against property (e.g., graffiti and vandalism) and some "victimless crimes" have been referred to as "quality-of-life crimes." American sociologist James Q. Wilson encapsulated this argument as the Broken Window Theory, which asserts that relatively minor problems left unattended (such as litter, graffiti, or public urination by homeless individuals) send a subliminal message that disorder in general is being tolerated, and as a result, more serious crimes will end up being committed (the analogy being that a broken window left broken shows an image of general dilapidation).