hello .
thank's , yes , heavy arty , it's home-made , look this :
wooden stalks of 8 mm x 8 mm ,a plate of plexiglas or the glass , the adhesive tape , some plaster , small piece of wood or kadapak ( cardboard plucks ) for window or door .
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with a putty knife , you spread in the frame having to mix the plaster with the water so that is thick and to let dry .
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I engrave the covered in plaster with a point has to trace to bound the place or I wish to reveal brick and with the small scraper , I remove a thickness .
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phil .