Why when you are high in the sky and looking from the window of an airplane, it seemed that it moves very slowly, but when starting to lose altitude to land, suddenly it feels that it moves much faster?

I was looking from the window of my airplane all the time. When we were high above the clouds, we see very, very slow movement, well look down continents.

Only when starting down low creates a sense of speed suddenly more movement. How do I explain this?