Only for the record, there is a "modern" material, called "glass block" since the '50's or '60's, the one in your photos seem like it (and there is no "prism" l

Only for the record, there is a "modern" material, called "glass block" since the '50's or '60's, the one in your photos seem like it (and there is no "prism" like the kind described in the main article) that can be used also for walls. Example: https://www.sevesglassblock.com/wp-content/uploads/2018/03/Technical_Guide_en.pdf https://www.sevesglassblock.com/wp-content/uploads/2018/03/T... (go to page 54 of the .pdf)