On one occasion when he was walking in the streets of Paris, he saw — this was real -- a scaffolding. But when he got back home, he saw a miniature of the scaffolding six inches high, on his study table. This repetition of perception is sometimes called palinopsia.
https://www.ted.com/talks/oliver_sacks_what_hallucination_reveals_about_our_minds
Does it mean 'a temporary structure on the outside of a building' or 'scaffold', which means 'a raised platform on which criminals were hanged or had their heads cut off'?