imagine an ocean with big, high waves. When you’re at the top of a wave – when things are going okay, when the depression isn’t at its worst – you have perspective. You can see that you’re at the top of a wave, you can see that there are other waves coming that you might be on top of at some point. You can see the sky, the land, other people swimming. You can also see that there are troughs, dips, in between those waves, but from up there, they are only part of the picture.
When you are at the bottom of a wave, however, in that deep trough in-between two peaks, all you can see is the sides of the waves on either side. All you can see is the water pushing around you. The sky feels so far away, just a speck in the distance. No one else seems to be around – you are alone in the trough. You forget that it was ever possible to be on the top of the wave… you can’t see the tops any more. The only thing you see is more water, the only thing you feel is the inevitability of the walls of water closing in on you.