After that lengthy digression, let's return to stitching. This refers to the photographic rendering of a broad area by multiple exposures, and the joining of these photos into one image. There were panoramic photos printed in the chemical darkroom from multiple frames of film, but it was always very difficult to minimize visibility of the seams or joins. With the advent of digital imaging (including digital scans of film), it became much more practical to produce visually undetectable stitched photos, requiring only that the photos overlapped somewhat and were consistent in exposure and color. I did some of this in Photoshop "manually". That is, with each photo on a separate layer, I would make one layer partially transparent and move it until it lined up precisely with the next. When all were aligned, they were returned to full opacity, and masks were used to blend the regions of juncture.
Now to the present, when things have become much easier if the goal is a seamless stitch. There are various software options that accomplish it automatically. Recent versions of Photoshop incorporate panorama creation. Last night, at intermission of a concert in Meymandi Hall, I stepped outside to see whether the thunderstorms in the area were active. (George Takei appeared with us - the North Carolina Symphony - and joked that he had "beamed down through turbulence.") The rain hadn't reached us yet, but the sky was begging for a photograph. I only had my iPhone with me. The camera's field of view wouldn't do justice to the spread of cloud formations, so I grabbed four overlapping shots, planning to stitch later. Here is the result.