Abstract: A pair of shallow open-sided housing halves are provided and pivotally joined along corresponding marginal portions for swinging of the housing halves between closed positions with the open sides of the housing opening into each other and open positions with the open sides of the housing defining an included angle of generally 90.degree.. The housing halves each have a plain mirror element mounted therein in recessed position within the corresponding housing half and structure is provided by which the housing halves may be releasably retained in positions with the reflective surfaces of the mirror elements defining an included angle of substantially 75.degree.. In addition, the last-mentioned structure also is operable to releasably retain the housing halves in open positions with the reflective surfaces of the mirror elements defining an included angle of 90.degree..