Imagine you’re in a room completely full of mirrors.
There should be no end to what you see in any direction.
Imagine you are traveling through this room.
Now imagine that there are holes – holes in the ground.
Imagine you might fall into them.
Imagine therefore that you have to walk very carefully.
The color of the room is like the color of the North Sea → it has another color every day: from blue to grey to brown to black.
So there is a constant change of color.