Photo illustration, using a triangular prism held in front of the camera lens, by Kristian Thacker Supported by By Daryln Brewer Hoffstot Photographs by Kristian Thacker Daryln Brewer Hoffstot is ...

Henry Dudeney, a self-taught English mathematician and puzzle columnist, asked his readers to dissect an equilateral triangle into the smallest number of pieces that could be rearranged into a square.