Abstract: A mirror assembly mountable on an arch of an infant activity center comprising a foldable floor mat, said arch bridging remote areas thereof, the assembly making it possible for a baby on the mat to see its own image as it engages in an activity appropriate to its age. The mat is flexible and the arch is bendable whereby the center can be collapsed to create a pack in which the mat is folded and the arch lies therein. The mirror assembly includes a disc on whose front face is a mirror, the rear face being hinged to one side of a triangular easel web whose other side is hinged to a sleeve fitted on the arch, whereby in an active mode of the assembly, the easel web supports the mirror from the arch, whereas in a collapsed mode, the web is folded against the rear face of the disc which is now sandwiched within the mat.