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Possible or Impossible?The 3D object in the applet below can be rotated by dragging the mouse or, when the Alt key is pressed, moved away or towards the screen.
Look at it. Is this a physical reality? My 9 year old son knows to make such a curiosity out of a piece of paper. Do you? 
Do It YourselfStart with a square piece of paper. Plain paper will do just fine. A colored piece should have the same color or design on both sides. Fold the square and grease it along the black line and then make three cuts indicated but the light lines.
It will now appear that there are three linked pieces of paper. Rotate the left one 90° clockwise around the black grease. Rotate the right one 90° counterclockwise and you are done.
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