You will see that as soon as you are drawing some schematics, it is actually very easy to explain this effect. The first schematic shows a camera that is aligned with the edge of a rectangular object of interest, for example a phone like last week.
Now let’s see what happens when we rotate the camera counter clockwise while keeping the phone in the same position.
You can see that it is actually the left top part that shifts out of the field of view the first. On the monitor we set the camera artificially parallel to the monitor edge. This results in the below drawing, and as you can see the phone looks like it is tilted clockwise while the camera has been rotated counter clockwise!