Thanks for the feedback.
I had not heard of Brewster's angle.
I will need time to consider these suggestions.


On Fri, Aug 11, 2023 at 3:11 PM MSF <> wrote:

> We call them "colors" down here south of the border, Harry. But to your
> question, yes I have experienced the same phenomenon. Keep in mind that
> peripheral vision is more light sensitive than foveal vision.
> I can think of two possibilities to explain the phenomenon. Light from the
> clear sky is partially polarized along a north to south axis. So if you are
> walking in a mostly north or south direction you would see these colors to
> your left or right as the angle to the area you are observing is around
> Brewster's angle. They would be secondary colors.
> Alternatively, it might just be a very thin oil slick formed from the
> asphalt and you need the more sensitive peripheral vision to perceive it.
> More than you wanted to know, probably.
> ------- Original Message -------
> On Wednesday, August 9th, 2023 at 7:36 PM, H L V <>
> wrote:
> This summer I have been walking to work in the morning during twilight
> just before the sun rises.
> As I walk across asphalt paved streets which are old and cracking,
> sometimes I see very faint bands of colour
> in my peripheral vision when I am looking at the pavement. When it happens
> I am walking roughly southward ( at 46 degrees north latitude) and the
> bands seem to appear on the left side of my peripheral vision. The colours
> remind more of those found in the Goethe spectrum rather than the rainbow
> spectrum. I wondered if it might be an effect of LED street lighting
> reflecting off the pavement but sometimes it seems to arise far from any
> LED street lights. Has anyone else experienced this?
> Harry

Reply via email to