H. B. G. Casimir portrays the following picture of George
Gamow in Copenhagen in the late 1920s:
Like many theoretical physicists he kept late hours and did
not like to get up early. Above his bed he had a picture
with a lowing cow, bleating sheep, a crowing rooster and a
sleeping shepherd with, underneath, the poem:
When the morning rises red
It is best to lie in bed
When the morning rises grey
Sleep is still the better way.
Beasts may rise betimes, but then
They are beasts and we are men.
Hendirk B. G. Casimir, Haphazard Reality: Half a Century
of Science (New York: Harper & Row, 1983), p. 118.
From this piece on George Gamow by Eamon Harper in Physics in Perspective, Vol. 3, pp. 335-372, 2001. Some of the photographs in the piece are very great too. Have fun!