We see what we expect to see: in reality, the ‘diagonals’ on each of the triangles is subtly different; in figure 1 it bends inwards whereas in figure 2 it bows outwards. The difference is just enough to create an extra ‘square’.   We see what we expect to see: in reality, the ‘diagonals’ […]

  We see what we expect to see: in reality, the ‘diagonals’ on each of the triangles is subtly different; in figure 1 it bends inwards whereas in figure 2 it bows outwards. The difference is just enough to create an extra ‘square’.

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We see what we expect to see: in reality, the ‘diagonals’ on each of the triangles is subtly different; in figure 1 it bends inwards whereas in figure 2 it bows outwards. The difference is just enough to create an extra ‘square’.