Maybe its referring to the way Feynman describes light travelling, for example in this lecture. https://www.youtube.com/watch?v=kMSgE62S6oo https://www.youtube

Maybe its referring to the way Feynman describes light travelling, for example in this lecture. https://www.youtube.com/watch?v=kMSgE62S6oo https://www.youtube.com/watch?v=kMSgE62S6oo It's something like, (and please don't try too hard to understand my description here, I watched the video over a year ago, and you've got Feynman at the link) imagine a photon is a particle going in all directions, and has an arrow inside it spinning at a rate of 10^15 revolutions per second, and the probability that light goes from its origin to a particular destination is the amplitude of the sum of all the internal arrows of the all the possible paths between the origin and the destination. Even if this is not what the article is referring to, its a reminder that for a lot of people, light doesn't move in straight lines. Finally, the series linked series of lectures are amazing, if you have a layperson's interest in Physics then this will take your knowledge to a new level.