Action has even more variance, having a home in the cliché phrase "lights, camera, action", calling to mind the film industry, and adjacently, the "action film", as well as being a euphemism for sex, or general excitement in some context. However, within the context of science, particularly physics, it can refer to a property of physical systems that describes how it changes over time, and is a vector quantity, or the concept of action at a distance, over which a debate still rages regarding the nature of wave function collapse.