So, in Young's double slit experiment, we see where the particle lands on the back wall.
What if we were standing at the back wall, looking toward the slits? Could we gain more information not by simply observing the light bouncing at the back wall, but looking at it our selves?
Of course, for electrons or lasers, that ain't a great idea. And the slits are too small for our eyes to really make out, I'd gather.
Frogs can possibly detect a single photon.
What if we trained a frog to lick its left eye if it detects a photon from the left slit, and its right eye if it detects a photon from the right slit.
Or better yet, build a tiny robot with a camera.
Would that robot see both slits illuminate as it detects the photon?
Seems testable in theory.