It's interesting that all the jewelry on that page are all abstract designs, just circles or wavy lines.
Someone somewhere came up with the idea of painting a motorcycle tank using lots of layers of different coloured paint, then scraping the each layer off to reveal a shape in the colour of the next layer. When they were finished, it was a geometric shape, or a logo, or maybe even a portrait.
I tried searching for something similar, but google isn't very helpful these days.
Just like the Philadelphia mass turbulence of 1947.
Thank you for sharing.
Those times when I've achieved runners high it was when I pushed myself to carry a heavier load, and walk faster. Never during endurance training.
I would feel my legs burn and there's a temptation to slow down, but that was the signal to forge on commit to walking faster.
At the time I had a very specific motivation for walking, and I wish I hadn't stopped walking when that motivation was gone. It's hard to start up again.