When you look at ships undersides or near water line in general there really isn't that many interesting parts. With sailing yacht you have keel and rudder, may

When you look at ships undersides or near water line in general there really isn't that many interesting parts. With sailing yacht you have keel and rudder, maybe propeller. Hitting keel doesn't do that much, but rudder can offer interesting tactile feedback. Kids love to break things, why don't same go for animals. Same with humans, with animal what is interesting? The big blob at middle or tangly bits like ears or tail?