A membrane is a word plus a register. Build, lift and run look like separate levels, but when every level is written in the same language the whole tower collapses into one membrane. The same fact shows up inside a word: at any nesting depth the mark comes back unchanged and one tick is spent.
Drag to orbit
Still open on the way to full residency: values as glyph words rather than ImasmTape vectors, arithmetic as word-walks, the square-root seed inside the vessel, and the search moved inside ∈…∋ so the count banks. The plate colours and the shell count in this view are schematic; the depth, orbit size and word length are computed from d.