Corrupted shelf-fungus spiral stairs

Spiral stairs 11 m tall: 51 shelf-fungus treads 2.05 m wide grown out of a fibrous newel, a 19 cm rise and 30 cm going, 29 to a turn, 2.05 m wide, with a vine handrail on stalk posts and a 1.75 m landing at 6.5 m. Made to climb the mushroom tower's hollow stalk (its attach_stairs socket) to the cap room floor at 9.88 m; fits any shaft 5.4 m across. Violet-black newel and near-black treads with plum rims and magenta glowing nosings.

5.10 × 4.96 × 11.51 m