Or is space a property of light? I don't know the math but I doubt if we 
can make space
  fundamental -- thought I suppose we have to if we want to start with 
geometry.;)
If I remember correctly, Einstein started with the behavior of light. 
But I suppose that must
involve space (a coordinate system) so ... hmmm.... Interesting but 
confusing topic.

David


andrel wrote:

> Take home message for me (although I might not do his derivation 
> justice): light is simply a property of space, not something that is 
> added later.

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