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Space can vibrate, space can fluctuate, space can be quantum mechanical, but what the devil is it? And, you know, everybody has their own idea about what it is, but there's no coherent final consensus on why there is space.

Now, what space ultimately is - I should confess, I think most physicists believe - we don't yet know.

In the context of general relativity, space almost is a substance. It can bend and twist and stretch, and probably the best way to think about space is to just kind of imagine a big piece of rubber that you can pull and twist and bend.

Space is almost infinite. As a matter of fact, we think it is infinite.

Why is there space rather than no space? Why is space three-dimensional? Why is space big? We have a lot of room to move around in. How come it's not tiny? We have no consensus about these things. We're still exploring them.

What really made me think about space and begin to think about ways to use it was Einstein's statement that there are no fixed points in space. Everything in the universe is moving all the time.

Our best theory of describing space at a fundamental level is probably string theory.

Space is certainly something more complicated than the average person would probably realize. Space is not just an empty background in which things happen.

Space has always been the spiritual dimension of architecture. It is not the physical statement of the structure so much as what it contains that moves us.

Space is something that you have to define. Otherwise, it is like anxiety, which is too vague. A fear is something specific. I like claustrophobic spaces, because at least then you know your limits.