“On a double-log plot, my grandmother fits on a straight line.”
as quoted in Herbert Kroemer's Autobiography http://nobelprize.org/nobel_prizes/physics/laureates/2000/kroemer-autobio.html, The Nobel Prize in Physics 2000.
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Fritz Houtermans 1
German physicist 1903–1966Related quotes

“My formula for happiness: a Yes, a No, a straight line, a goal.”

“I did my best to go in a circle, hoping in this way to go in a straight line.”
Molloy (1951)
Context: Having heard, or more probably read somewhere, in the days when I thought I would be well advised to educate myself, or amuse myself, or stupefy myself, or kill time, that when a man in a forest thinks he is going forward in a straight line, in reality he is going in a circle, I did my best to go in a circle, hoping in this way to go in a straight line. For I stopped being half-witted and became sly, whenever I took the trouble … and if I did not go in a rigorously straight line, with my system of going in a circle, at least I did not go in a circle, and that was something.

Mould Manifesto against Rationalism in Architecture (1958)

But all that is not yet clear in my mind.
Quote in Mondrian's letter to artist Gorin, [who stated that the double line broke the necessary symmetry], 31 January, 1934; as quoted in Mondrian, - The Art of Destruction, Carel Blotkamp, Reaktion Books LTD. London 2001, p. 215
1930's

“The straight line belongs to Man. The curved line belongs to God.”
The real author seems to be Pierre Albert-Birot https://books.google.com/books?id=3Ul51CwjUOcC&pg=PA290&dq=%22the+curved+line+that+belongs+let%27s+say+to+God+and+the+straight+line+that+belongs+to+man%22&hl=de&sa=X&redir_esc=y#v=onepage&q=%22the%20curved%20line%20that%20belongs%20let%27s%20say%20to%20God%20and%20the%20straight%20line%20that%20belongs%20to%20man%22&f=false.
Attributed

“The straight line is godless and immoral.”
Mould Manifesto against Rationalism in Architecture (1958)

“Language fits over experience like a straight jacket.”