From my archinves, we saw this a few years ago while exploring the Seattle waterfront. Sculpture is called “Welcoming Spirits” by Melvin Schuler, dated 1997.
I’ve been using Brashley Photography’s Twirling Tuesday to experiment with the different blend modes for layers. Playing with the bright spring colors is more fun than reading the technical descriptions.
Directions for doing the twirling effect in Photoshop are in the Brashley Photography Post. If you use GIMP, like I do, this post: Putting a twist on it using the GIMP, explains how to do it.