Physical magic is one of the hardest forms of magic , and defies the very thing we know an love , humanity. In order for a spell to bend physical reality and matter we need so much power and nothing to stop us in the fruition of it , this is a paradox in its own right because we are human , we are constantly barred off from our potential because of our general life and emotions. For us to reach a state of material manipulation we need to reach a state without emotion a feeling of pure will that can bend anything around us , becoming emotionless is somewhat unimaginable , but Nirvana , the state of all-being in Hindu and budist cultures , or the state of one as its known in most european cultures can be reached and utilitzed for it. It takes years of practice and hardship to reach the strenght needed to evoke emotionlessness in one self at will.
Question: If we're emotionless and we're doing something because of love or hate , whats the point?
Answer: If you are emotionless that doesn't mean you'll have no need for anything or wish for it , or does it? We just don't know until we reach it.
So shrinking , morphing , kinesis of all kinds and general "fantasy" magic isn't fantasy at all , its pseudoscience meaning is 100% possible by the laws of nature , we just dont know how to do it.