If you think there's nothing wrong, try building a physical model of it. Oh wait... Please Register or Log in to view the hidden image!
The picture is based on M.C. Escher's "Ascending and Descending" https://en.wikipedia.org/wiki/Ascending_and_Descending It is based, as a number of his works are, on the idea that you can represent something in 2D which would be difficult to reproduce in 3 dimensions I was able to create a 3d model version of it here: Please Register or Log in to view the hidden image! However this requires a bit of trickery. Using the same type of trick, I reproduced his "Belvedere": Please Register or Log in to view the hidden image! Which is relies on careful camera and element placement. From a different angle, you would get this: Please Register or Log in to view the hidden image!
I still dont understand, where is the trick? Can we build the actual 3D model of the staircase? Can we use 3D printer to produce it?
It's an optical illusion. In the illustration that you posted it can look like the people are continually climbing. If you look at it in another way it can look like the people are continually descending.
Never mind all the CG drawings. They built an actual one out of Lego. Unedited photo: Please Register or Log in to view the hidden image!
It's a type of art the "deceives the eye". It can be a 2d representation of a 3d subject that seems to jump out at the viewer or it can be like the picture that you posted that sees to show something that isn't possible (an optical illusion).
Yes. You can see actual, real-life versions of the staircase in at least two photos above: the lego one and the one with real-life people on the staircase (actually from the film Inception). Neither of the photos is altered. This is what the camera saw. If you like.
Did you notice he had to use a longer pencil to reach down into the hole to do the shading???Please Register or Log in to view the hidden image!
Like James R said, you can physically build these things. However, they will only appear as they do in the photos, when viewed from the right direction: Please Register or Log in to view the hidden image!
