sketch of a spiral staircase

March 22, 2023

A pencil sketch, portrait orientation. In the center of the page is a doorway with a pointed-arch top and no door. Through the doorway can be seen an ascending spiral staircase. At the bottom left corner of the sketch is a small rough polygon divided into triangles and missing a section, a bit like a nautilus shell, like a rough top-down view of a spiral staircase.