Huh. I meant radical in the sense of large surface area. And I was thinking ~cylindrical. But radial is a great idea. And as soon as I started playing with pap

Huh. I meant radical in the sense of large surface area. And I was thinking ~cylindrical. But radial is a great idea. And as soon as I started playing with paper, the ancient muscle memory of folding filter paper came back to me. Edit: OK, I used filter paper from a shop vac, 20 cm wide by 30 cm high, with six faces triangular faces on the top and bottom, and eight faces on the sides. The ends of the faces on each side are sewed together, with an elastic strap connecting them. So the base is a diamond, ~18 cm wide and ~12 high. There's cloth edging on the top and bottom, and a cloth-wrapped 1 cm x 5 cm strip of aluminum edging to seal the top of the nose.