Why is the top of a canyon visible from the bottom during a rainy hike, but once at the top, the bottom is invisible because of the fog?

Question

During a rainy hike canyon walls are visible from the bottom (although a bit foggy). However, when I got to the top, I couldn’t see the bottom anymore—everything was just white. Can someone explain like I’m five why the top is visible from the bottom, but not the other way around?

Edit: missing detail, the weather didn’t change throughout the hike. An the Bailong Elevator led to the top so we reached it within a minute or so. When going down by a cable car the canyons became visible again.

In: Physics

Answer 1

Another analogy: a thin lace curtain or mosquito net can block people from looking into a room, but from inside the room you can still see out.