it is called The Ambassadors:http://en.wikipedia.org/wiki/The_Ambassadors_(Holbein)
look at the bottom there are something like a plate, but it is a tilted 2D skull with regard to the viewer outside, and if you enter the Ambassador room you can look at the object and see this 2D skull.
i am sure the tilted or rotated objects are related to the matrix math like the OpenGL math. but i find it easier to imagine it as a compressed object (wich may be also have relations to matrices?!!!).
so we can resize the skull image vertically by 5 to see it semi normally.
attached the skull picture before resizing (after rotating it) :
and after resizing:
i have used the image.pb from the pb examples folder to display and resize vertically the image
If OpenWindow(0, 0, 0, 640, 480, "Image Resize")
If CreateImage(0, 416, 304)
ResizeImage(0, 416, 304)
ResizeImage(1, 100, 500)
EventID = WaitWindowEvent()
If EventID = #PB_Event_Repaint
DrawImage(ImageID(0), 20, 10)
DrawImage(ImageID(1), 440, 0)
Until EventID = #PB_Event_CloseWindow