How to pronounce“Poisson”in English

We don't see Poisson's spot in our day-to-day lives for many reasons, one of which is that most objects are not prefect circles.

You might think you could never see Poisson's spot under ordinary conditions.

And right in the middle of that shadow is Poisson's bright spot.

But pretty frequently, it's referred to as Poisson's spot.

Plus if they have any surface roughness, really any at all, that will completely wash out Poisson's spot.