Nintendo tumbler puzzle Nintendo tumbler puzzle The Nintendo tumbler puzzle, also known as the "Ten Billion Barrel" in English and originally in Japanese, is a mathematical puzzle in the style of Rubik's Cube. It was invented by Gunpei Yokoi of Nintendo in 1980 and was covered by (until the patent expired in March 1995 due to non-payment of a maintenance fee). It consists of a "cylinder" of transparent plastic divided into six levels, together with a black plastic "frame". The frame consists of upper and lower discs that are joined together through the middle of the cylinder. The top and bottom levels of
A&D Wejchert & Partners Architects A&D Wejchert & Partners Architects Wejchert Architects, formerly "A&D Wejchert & Partners Architects" (known as "A&D Wejchert Architects") is a firm of architects based in Dublin, Ireland. The company was established in 1974 by Polish husband and wife, Andrzej Wejchert and Danuta Kornaus-Wejchert. Andrzej Wejchert began working in Ireland in 1964 and successfully tendered for the design of the University College Dublin (UCD) campus. He later lectured at the UCD School of Architecture. In 1997, he received an honorary doctorate in laws. Andrzej died in 2009, and Danuta in 2014. Their daughter Agneszka Wejchert Pearson is also an architect. As