I was outside. The reason it looks rectangular is because I took a scren shot of a video. It was moving in the video, so it left a "trail" if that makes sense. I wish I could post the vid.Looks a bit rectangular to me, so please try and find a rational source first if it is a reflection of a viewfinder or microwave clock.
After thousands of hours of watching video of nothing happening I have seen similar reflections in right-angled glass. In fact anything near glass can be suspect.
I'm not saying no by the way. - Just be aware of reflections.