Dr Michael Mosley, back pain pills that are only rice, and that keep working even after the patient knows the truth of the placebo.
Mimes: creating belief in a scenario eg being trapped in a box.
Fake glass door prank: an object inspiring misplaced belief.
Using mirror effect to imply what isn’t there – a 3D optical illusion if you will (cf the optical illusions I draw that imply multiple spaces within a cube INSERT PHOTO)
Magnets for visualising the invisible