A floor lamp nestled against a window is a smart substitute for daylight so that when the sun goes down an ambient glow will pour in from a similar direction to balance the central light overhead.
Adding lights as decorative elements helps set a mood in a space. Provided that general lighting is already installed using lights instead of wall art can be a decorative way to provide ambient lighting.
Consider your lighting preferences during the initial design phase of a new build or renovation. For example if you want three pendant lights over your dining table instead of one or two that should be taken into account before construction starts.