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The eye of a human being is a microscope, which makes the world seem bigger than it really is.

We're giants, and we're unaware of things that are too small for us to see.

There could be more to the universe than the three dimensions we are familiar with. They are hidden from us in some way, perhaps because they're tiny or warped. But even if they're invisible, they could affect what we actually observe in the universe.

We view things not only from different sides, but with different eyes; we have no wish to find them alike.

Everything's got space between it, the planets, trees, your eyes. Your eyes get too close together, it's a whole different world. You can lose perspective.

If I take the theory as we have it now, literally, I would conclude that extra dimensions really exist. They're part of nature. We don't really know how big they are yet, but we hope to explore that in various ways.

As far as extra dimensions are concerned, very tiny extra dimensions wouldn't be perceived in everyday life, just as atoms aren't: we see many atoms together but we don't see atoms individually.

Evolution has ensured that our brains just aren't equipped to visualise 11 dimensions directly. However, from a purely mathematical point of view it's just as easy to think in 11 dimensions, as it is to think in three or four.

We can see, so we are always blind to things deeper than skin.