Voids in Architecture can be found in three varying scales, at an urban level in relation to paths, roads, public squares and parks. At a building level, in the form of a courtyard, lightwell and atria. And in an indidual room with roof lights, loggia and apses.
There are two further classifications of voids, Functional Voids that literally serve a purpose, breakout spaces, lift shafts, service voids, fire escapes etc and Cognitive Voids that are used to create a visual effect and accentuate the human condition and experience of the building itself, created to promote emotion and connect with the building in a way that you could argue is a numinal experience