A surprisingly difficult tiling puzzle, given that there are only four pieces;
it dates back to the start of the 20th century. The four pieces shown must
be arranged to make a symmetric capital T. You are allowed to rotate the
pieces as you wish and even turn them over, but they mustn't overlap in
the final letter. In fact two different symmetric capital T letters can
be made from the pieces. Also, two other symmetric shapes can be formed
from the set, including an isosceles trapezoid.