Why do magicians have the ability to change people but not themselves?

In fact, magicians use props to change people. As long as the props allow, it is ok to make yourself disappear. For example, 1. Hang a beautiful woman in a cage in mid-air and turn into a beast. In fact, the method is very simple. A board was erected behind the cage, and the beast was caught between the board and the cage wall. When the cage rises into the air, cover it with a cloth. At this time, the beauty can hide herself under the board as long as she gets the board conveniently, and the beast will come out. There are also many props, such as the diffraction of mirrors, which cause visual errors and so on. Magic is entertainment and can be done with permission of props, while close-up magic requires many requirements, skills, props and so on. I hope the answer is useful to you ~