That's what makes or breaks a great photograph. A great photograph is one that lasts with you long after you've seen the actual photograph. Horrors for Margret. Horses for Wendy. Without horses, there's no jockeys.
Jockeys are usually like thin wafer sticks.
They're short in height and light in weight, but tough as horseshoes. Their task is to hold on like grim death with a creature 15 to 20 times heavier than them and probably 50 times faster than them on foot. Beyond that, everything is simply a relationship of convenience between the horse and jockey. More a convenience for the jockey than the horse. Whatever, this relationship of convenience has evolved into a fine art of breeding, racing, and nurturing horses for man's pleasure.