Armored safety glass can be etched on both sides when in place, giving a definite three dimensional appearance.
When such glass is on a passage way, as it was in the illustrations, the viewer, in walking past, changes the viewpoint, giving a varied, changing interlinking of lines. The method is fairly straight-forward.
Cover the entire glass area with adhesive tape, then cut into the tape with a sharp knife, peel the tape back, exposing the plain glass. This is then etched by blasting the exposed glass with grit under great pressure.
This operation is executed on both sides.
The tape is then completely removed, exposing the completed design.
Was this the method used by Alan Boyson in Manchester, St Anne’s for his etching on glass?
With thanks to William Mitchell