Question It occurred to me that there may be an assumption that an energy source emits via a wave function with a defined direction, such as in the double slit experiment, which is a controlled experiment. But what would be the implication in a case where the energy source spreads (emits) its wave function in 3 dimensional directions? Is this a valid question in context of the above illustrations? p.s. This reminds me of an Einstein lecture on the "man in the box", where an observer is inside a box which is travelling upward at near spead of light. When the box passes a ightsource outsde the box, a small hole in the box allows a beam of light to enter the box and travel to the opposite side. While the beam of light travels in a straight line, the box moves upward during the time it takes for the light to reach the opposite side of the box, to the observer the light beam will appear to bend and hit a lower target than if the box were stationary, but even though the beam appears to have travelled a greater curved distance, it will hit the opposite side at the same time as if the box were stationaryc, creating an illusion of.gravitational pull. I found this a fascinating observation.