changes those colors and patterns when desired in fig1 and 2 the device 10 includes a window 11 formed from two sheets of glass 17 18 that are each about 1 16 u2033 to about u00bc u2033 in thickness the sheets 17 18 form an ultra thin about 0 1 to 20 mils interchamber 19 therebetween the interchamber 19 is filled with a mixture of chemicals and is sealed airtight by seals 15 16 at a very low pressure the mixture of chemicals may include gases of various parts per billion sealed within the interchamber 19 composition of many gases is possible as to create color and density for example the mixture may contain nitrogen gas a liquid mixture of phosphors and an oxygen moisturizer phosphors are chemicals that absorb radiant energy of a given wavelength and reradiate at longer wavelengths through a process of phosphorescence thereby producing visible light when excited with ultra violet uv radiation phosphorous occurs in a variety of allotropic forms including the familiar highly reflective white form and a much less reactive red form and a black modification that will appear to be the most stable form alternately the inside of the glass may have a phosphor coating instead of the liquid mixture nitrogen is a gas that.