If you are real, and not a construct of my mind, then you can not form and bend to my will. If everything was an illusion, I would posses the power to form anything I wanted, because all everything else is what my brain is perceiving. Just thoughts. I could use my thoughts to project anything. I would not be bound to the laws of the universe. I could defy gravity, make energy and destroy it, I could move without being acted upon by an outside force, etcetera. I could even deform the molecules of concrete items, and simply turn them into matter, ready to bend to whatever my mind wants to project. After all, all that I would be perceiving would just be thoughts, and so all I would have to do is think what I want.