Have you ever looked down and found that you are standing on something rather unexpected?

I grew up in a place that experienced frequent small earthquakes. If you have ever felt one, you know that no matter how small the movement of the solid earth beneath you, it always throws you off center. Sometimes you feel like it must be in your head, this sudden motion from something that felt so solid. You might feel a bit queasy, a bit off balance, like the world isn’t as it seems. If you’ve studied a bit of geology, you’ll know that there’s a whole world beneath your feet that you really can’t see with your own eyes – and it’s always moving and shifting.

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