Building

Building is either the act of creating an object assembled from more than one element, or the object itself. Buildings are usually a human-created object composed of more than a single element, permanently fixed to the ground, that mediates one or more aspects of the environment.

Buildings may be as simple as a lone roof providing shelter from the rain for a single occupant, or as complex as a hospital regulating temperature, air flow, light, gas content, bacteria movement, particle flow, pressure, and people movement and activities.