Learn what a grook is.
... and know more about this “mathematician / poet / furniture designer / playwright / national treasure (in Denmark) / ladies man / philosopher / game designer named Piet Hein (1905-1996)” in:
Angus W. Stocking (February 16th 2009). An Appreciation of Piet Hein: The Man Who Wrote 10,000 Grooks. Retrieved on 23.03.2012, from http://www.otherbs.com/2009/02/16/an-appreciation-of-piet-hein-the-man-who-wrote-10000-grooks/.