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of light is a beam of light that's not flaring out. It's very concentrated. And you pass it to a very, very close list of light. And depending how you're measuring it, you can look at a back and you'll see what looks to be either a bunch of lines that are showing the interference and patterns happening back there. Or if you try to measure it yet, but a measuring device behind the screen as you're measuring the photons or electrons that are coming through the slip, then you end up getting a pattern that looks like a shotgun pattern of individual parts, so it's almost like the electrons or photons that are being measured. And they're acting weird at that point. So it shows that an observer is actually changing the outcome of an experiment on a quantum level.