Olafur Eliasson, Roof for stray thoughts, 2022, coated steel, mirror polished stainless steel, 5 × 30 × 55m; 88 metric tonnes. Quay Quarter Tower, SydneyOlafur Eliasson, Roof for stray thoughts, 2022, coated steel, mirror polished stainless steel, 5 × 30 × 55m; 88 metric tonnes. Quay Quarter Tower, Sydney