Exercise: Rhythm and Pattern

To be honest, I've to tell that I haven't understood the difference between rhythm and pattern yet. I know that in rhythm the eye follow a direction and pattern is a more static concept but I find them very similar.

I've chosen this picture for rhythm because I see a dynamic repetition in the opened windows and they create diagonal lines as the eye crosses the image from side to side.

Camera body: Nikon d90
Lens: Nikkor 70-300 mm f/4-5,6
Focal length: 190 mm
Exposure: 1/160   f/8
ISO 200. No flash, no tripod.

For "pattern" I've selected the following photograph. It's a detail from the Vatican ceiling. I cropped it to leave outside the frame the ceiling edges, so the repetitive tiles fill the frame. 

Camera body: Nikon d90
Lens: Nikkor 18-55 mm f/3,5-5,6
Focal length: 18 mm
Exposure: 1/125   f/5
ISO 400. No flash, no tripod.