Stone glyphs are old. Their ‘jigsaw’ design particularly suites relief work–stonework, woodwork, masonry. In my mind, they are found on stones and ruins, carved from the walls, roofs and columns of stone temples and ornate wooden shrines. This was the birth of Pseudoglyphs.
To help you understand how stone glyphs are built, below are examples of how Umu would handle loanwords from English.
The first thing to do is arrange our building blocks. Because this version of the syllabary was not made to write English, we’ll have to translate. (An English version of Pseudoglyphs is possible, capable of representing most English sounds. Not today though).
Next, the symbols are morphed into a single glyph. The outer membranes of each block are fused together like bubbles. The inner nucleus remains intact.