and the phosphorescence may be terminated when desired a phosphorescing material may be exposed to an energy source that causes the material to stop phosphorescing thus a pattern may be written on a surface which is phosphorescing using a coherent energy source the written pattern represented by darkened regions may be recognized by users as a symbol a graphics or text application_number US 78591701 A description referring to fig1 one application of the principles set forth herein is in connection with a wide variety of toys as a toy example shown in fig1 a drawing toy 10 may include a housing 12 with an inclined drawing surface 13 a child may use an erasable marker 18 to draw on the drawing surface 13 however in this embodiment the child 39 s drawing may be guided by a pattern 14 that has been formed on the drawing surface 13 to guide the child 39 s depiction of the object thereby the child may simply trace over the pattern 14 to create a suitable design on the toy 10 turning to fig2 the child 39 s eye indicated as e may view the drawing surface 13 from one side on the opposite side of the surface 13 may be coated a phosphorescent layer or film 20 in one embodiment the layer 20 may be opaque the layer 20 may be formed of any phosphorescent material that glows for an extended amount of time in one embodiment in one embodiment the surface 13 may be formed of a transparent material such as a plastic sheet having the phosphorescent layer 20 merely coated on one side when the phosphorescent layer 20 is exposed to a sufficient energy source it.