Principles of Design- Repetition

Original

Edited

Exposure:-.1
Contrast:+48
Highlights:-54
Shadows:+38
Whites:0
Blacks:-42
Clarity:0
Vibrance:0
Saturation:0

I made the picture a bit darker so that bars would stand out. With four of them in a row, they show repetition, and the shadows show it as well.