In the book I learned if it's a flat surface, someone will put something on it. This article adds to that lesson, if it's a sit-able surface, someone will sit

In the book I learned if it's a flat surface, someone will put something on it. This article adds to that lesson, if it's a sit-able surface, someone will sit on it. Not just sit, someone will set foot on it, lean against it or interact with it in whatever way.