In the double slit experiment, the bar with the two slits is a lens. If you change the location of the lens it changes the focal point which changes the picture you see on the screen and the results  of the experiment. You can go a step further and put on the wrong prescription glasses when you view the results of the experiment, this will change the entire history of the experiment and change the results you observe.   On to entanglement. You have two entangled...