A system for inexpensively placing an active fall-protection system in a floor is described. The floor is tessellated with large octagonal tiles and smaller square tiles. Each large octagonal tile contains a sodium azide-loaded airbag that expands, upon detonation, to 18 cm tall. Each square tile contains an infrared proximity detector and a differentiation. Upon accelerating approach of a large enough infrared-emitting object (such as a falling human body) the square tile detonates the four adjacent octagonal tiles. In this manner, the airbag tiles are deployed over the area of the floor destined to be impacted. Since the detectors respond to accelerating, large infrared-emitting objects, the floor tiles will not deploy during normal activities.