I thought this was a very interesting concept where psychology meets art meets interior design.
Artist Daniel Rybakken created this end-table that projects an illusion of sunlight coming through a window. You might think, “What’s the point of that?” But in practice, light can be shown to give a perception of expanded space. So if you’re stuck in a claustrophobic small window-less room, something like this might actually help.
Check out his other work, he seems to have several projects involving perception and light.