The "Two Sides of a Coin"
Get used to turn a picture upside down and reveal the two faces of it

      The picture (left) shows a dark bowl filled to overflowing with various root vegetables. When we turn the picture round by 180o, this bowl full with vegetables turns into a head (right), chubby-faced and unpolished like the vegetables themselves.

      The Bowl with Vegetables and the Vegetable Gardener by G.Arcimboldo

      The picture (left) shows ancient bubbles trapped in sandstone - convex shape. When we turn the same picture round by 180o, this convex shape turns, surprisingly, into concave (right), and vice versa.

     

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