File talk:Pieter Bruegel the Elder- The Magpie on the Gallows - detail.JPG

Note the optical illusion of the Gallow

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Please clarify the reason for this gallow to be impossible. I see only a combination of vertical, horizontal and oblique beams (roughly, square prisms) in one vertical plane, with clearly visible front surfaces. Incnis Mrsi (talk) 13:42, 20 February 2011 (UTC)

In my opinion, both the vertical and the horizontal parts cannot exist in reality (3D) because they are irregulary twisted. Too bad, I cannot proof it mathematically (I flunked the Maths classes since 5th grade). Your graphic is not being properly displayed (UTF-8 provided). --Mattes (talk) 11:42, 4 March 2011 (UTC)

I see no twisted beams at all. We see front, left and upper surfaces. Vertical beams have both front and left surfaces visible, left are bright. Junctions to left surface of the right beam are visible, junctions to right surface of the left beam are invisible. Horizontal beam has both front and upper surfaces visible, upper is bright. Junctions to lower surface of the horizontal beam are invisible. Oblique beams also looks accordingly to axonometric projection and are illuminated correctly. Where do you see a problem? Incnis Mrsi (talk) 19:48, 5 March 2011 (UTC)