Dudeney’s Dissection is the solution of a problem  Henry Ernest Dudeney publshed in 1902 in a english newspaper. The challenge was to cut a equilateral triangle into the smallest number of pieces, such as they could be rearranged to form a square. One reader, a certain Mr. C.W. McElroy of Manchester, found the best solution with only 4 pieces which later became known as «Dudeney’s Dissection»

Aluminium, anodized