I have used the chrome gradient and the image is made up of the left side copied and flipped to the right side.
That stacking action is getting more use than I could ever have imagined.
Frank, thanks for answering my question! Now I understand what you did. It's similar to what I did in my "image stacking" entry. I applied a Diamond gradient to one corner of the canvas and, then, duplicated and flipped the layer(s) horizontally and vertically.
This action is a winner! I love it!
Photoshop Elements 7, Photoshop Elements 10 through 2021 Photoshop 2021 & Lightroom Classic 10 Windows 10 Pro