How does Richard Feynman use imagery in Surely You're Joking, Mr. Feynman!?

Example of Imagery:

“The sun was going down and the sky was turning red and orange behind the mountains. The clouds were turning pink and purple and gold; it was beautiful. I was sitting on the edge of the water with my feet in the sand, and I was watching the little crabs running around on the beach. They were so cute, and they were all different colors - blue, green, red, yellow - and they were all scurrying around, digging holes in the sand and then running back into them.”