Glyphs tell a story. Usually the glyphs progress along a medium to display the story. Sometimes in relief form - carved as little statues raised above the background slate or symbols that represent a meaning and/or sounds.
Some glyph stories are painted or etched on/into stone tablets. Some stories appeared on curved surfaces, from vase and pots to pilars in the temples of deities. To view the whole story: means moving around or along with perspective to the story line.
Or turn/move the glyphs into view, so the story is told. The tetra orb shows a series of symbols if turned and viewed from certain perspectives.
Looking at the tetra orb will reveal symbols, or the symbols can be seen in shadow form shapes - when light casts a shadow upon a flat surface.
So the tetra orb is a portable story glyph; An enduring storage devise. A garden Sundial is another 3D glyph - which tells the time with the projection of a shadow via the style (gnomon) upon the surface of the dial.
Both simple devises of 3 dimensional form. That can be activated with light; not by touch of the contours of the form - as in relief type glyphs.