Passage: The painting shows a world landscape, with the foreground a woodland clearing containing three peasants dancing to a bagpipes, next to a gallows upon which a magpie is perched.  The gallows stands in the centre of the picture, dividing the painting in two, a Mannerist composition with the right side more "open" and left more "closed", with the magpie close to the exact centre of the painting.  The gallows appears to form an "impossible object", similar to a Penrose triangle, with the bases of the posts seemingly planted side by side, but with the right side of the cross-member receding into the distance, and contradictory lighting.

Question: What type of non-existent geometric figure does the gallows in the painting resemble?
Penrose triangle