Ok, I didn't actually see this woman in person at the Mermaid Day Parade, but once I went online looking for pictures, she was everywhere!
I am super impressed with the engineering of her peacock tail. From the looks of the pictures, she was able to fan and unfan it. However I'm sure by the end of the parade route her arms were tired from holding it up. Bet it was worth it though. She looks amazing and vibrantly colorful in every picture. Inspired!