Reference A visual reverence on how spiral staircase of similar structure may look. I was also looking at the proportions of stair and steel beam. Apr 16, 2021 Reference / Kasia blog by blogadmin is licensed under a Creative Commons Attribution CC BY 3.0 16th April 2021 In Uncategorised ← Previous Post Next Post → Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.