Reverse | Cornelius Gijsbrechts, 1668

Proposal: Next to Cornelius' painting, two canvases glued together, back to back, revealing only the backside of each canvas, suspended sideways from the ceiling in such a way that the visitor can walk all the way around them, with a red sticker attached to the edge.
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What lies behind a masterpiece?

The Reverse of a Framed Painting
Oil on canvas 66.4 x 87cm
Statens Museum for Kunst (SMK), København