Reverse | Cornelius Gijsbrechts, 1668

Proposal: Placed on the ground, beneath the exposed canvas, is a copy of Cornelius' painting of the same dimensions, wrapped in kraft paper with a red sticker attached to one corner and a label that reads: a copy of "The Reverse of a Framed Painting" wrapped – unless it’s the original...
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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