IMPOSSIBLE SQUARINGS? September 98

(A) The insolent square of the fig. a) below is composed by 4 identical geometric shapes, these ones form also a perfect disc when shifted. Can you guess what these shapes are exactly ?
(B) Is it possible to transform a cube (made in pvc foam) into a sphere (and inversely) with only a few manipulations? Yes, it is... prove it!

INGENIOUS METAMORPHOSES puzzle of the month
© 1996-1998, Sarcone & Waeber, Lausanne

Here is the first solution (fig.a)
solution 1
© 1996-1998, Sarcone & Waeber, Lausanne

...and here the second one (fig.b)! solution 2
© 1996-1998, Sarcone & Waeber, Lausanne


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