Streetcar wires

I've noticed recently that, without any conscious decision on my part, a considerable number of the photos I published have the sky as the background.

One of the possible explanations for this is that I like how a sky background allows for a clear depiction of the photo elements.

Another is that, being colourblind, there are things that only attract my eye when placed against a non-cluttered backdrop.

Whatever the reason, here's another photo taken when looking up.