Edit Dec 28, 2020:
There will be no voting in the end of december. The whole month's topic has been extended 1 month. Official end of contributions and beginning of voting starts Jan 27, 2020!

One of my favorite topics is man-made vs. natural in juxtaposition.
Light/dark seems fitting for the time of the year. Here in Finland the days are getting really short.

So the theme is
Contrast: Light and dark, man-made and natural

Rules:

• Photos must be taken during this month and posted before voting starts.
• Photos must be taken by the posting member.
• Photos must be taken with your phone's camera.
• Post processing is allowed but you have to say what you did.
• Users must name the phone and software they used.
• There can be only one entry per user, but posting multiple pictures is OK. The user must specify which picture is the entry for the month.
• Users can change their entry only once.
• The three day voting period starts on December January 27th at 20:00 UTC and ends 00:00 UTC of February 1st (don't ask me to actually enforce timezone precision).
• The winner of the vote should choose next month's competition theme, and open a new thread.
• You are allowed to continue posting in this thread after the competition.

Enjoy!