Done by human hand, the overlapping discs. Some poor underpaid laddie in China, hence the brilliant price tag...
I hear what you're saying. Most everything I see, mechanical or fabricated, I tell the wife hah, I could make that myself. This usually encompasses brackets, ornaments, gates, fences, hinges, stands, cupboards, tables, railings etcYou may find yourself self diagnosed when you catch yourself ranting about the design of something to your wife, with the words "I could do better in my shed"...