But you want to know what is magic about physics?

Forces. Forces are definitely observable. But they are fictitious. A photon (force mediator of the electromagnetic force) is a packet of energy on the electromagnetic field that creates a curvature in the electromagnetic field such that two particles with opposing charges (intrinsic charge) has that field curved together, resulting in what an observer would see as a force.

Gravity? The thing keeping everything on the ground? Not real. Just a result of the spacetime field being curve by the presence of energy in it. In order to escape the curve, you have to exchange energy, which is to be a force.