Banach space, yes, but I'm returning to knowing only the name :) Cardboard as box (and as space filling surface?) is a very nice interpretation; I'd been think

Banach space, yes, but I'm returning to knowing only the name :) Cardboard as box (and as space filling surface?) is a very nice interpretation; I'd been thinking of "singing to a backing track/lipsyncing" in which phonogramma gets shortened to phanera which machine translates for me as "singing under cardboard"...