In the untitled work... I see... like a Roman theater made of metal, that's the first thing that came to mind.
I can't remember exactly what material it was, but it may very well be plastic 😬
As for the last two works, my brother is a technician, so I've seen those pieces many times, and I'm passionate about the second one!
Maybe you can use some pieces that are not functional anymore :)
Well, a plastic Roman theatre...
Since we moved from Argentina, there's nothing like that here, and he doesn't do that anymore... he does repair my computer, though! But that art is great, innovative!