I took a long time to think about this stitch because it didn't really appeal to me at first. Here it is from the Barbara Walker site.
It does, though, remind me of low stratus clouds and that usually means rain - as in "mackerel sky - rain by and by." Maybe this is why I didn't like the stitch at first because it reminded me of a cloudy day. Then again I never mind seeing a mackerel sky when we need rain. Here is a picture of a mackerel sky, so named because the clouds resemble the fish scales of a Mackerel.
Now I'm not sure where the telescope part comes in. Maybe the lattice looks like an elongated telescope. Anyway shooting clouds probably works better with a telescopic lens. I just used my Canon SureShot here and the effect is still of fish scales, though the striping of the clouds could be clearer.
Now that I'm on the subject of clouds. Here is a picture of my kind of cloudy day - full of magnificent white clouds (each with a silver lining, no doubt), lots of blue sky and sun!!!
Have a magnificent day!!