Piet Hein

Piet Hein (16 December 1905 – 17 April 1996) was a Danish scientist, mathematician, inventor, designer, author, and poet, often writing under the Old Norse pseudonym " Kumbel " meaning " tombstone ". His short poems, known as gruks or grooks (Danish: gruk ), first started to appear in the daily newspaper " Politiken " shortly after the Nazi occupation in April 1940 under the pseudonym " Kumbel Kumbell ".