GR by R. Wald: Apple & Canopy Cover Explained

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The cover of R. Wald's book "General Relativity" features an apple and a canopy, which symbolize concepts in general relativity (GR). The table depicted represents a flat Euclidean space, while the apple illustrates the curvature of space, a fundamental aspect of gravity in GR. This imagery connects to the historical anecdote of Isaac Newton, who was inspired by an apple falling from a tree to formulate his theory of gravity. Additionally, the cover art is identified as "Les Belles Realites" by Magritte, further emphasizing the relationship between perception and reality in the context of gravitational theory.
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I have recently notice that I the book General Relativity by R. Wald has
quite strange cover. Do you have any idea what's the relation of
apple and canopy with GR?

4197-nS5HHL._BO2,204,203,200_PIsitb-sticker-arrow-click,TopRight,35,-76_AA300_SH20_OU01_.jpg
 
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The table represents a flat euclidean space. The apple represents a curved space which is a model for gravity in GR. Incidentally, there is a story about Newton who was sitting by a tree and an apple fell down to the ground and it inspired Newton to develop the Newtonian theory of gravity.
 
The painting is "Les Belles Realites" by Magritte.
 

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