We See but Don't

With thanks to New Career, who gave me the idea, a Blip of something we see almost every day but don't see.
In their own way quite striking and shiny - modern 'art' in a common place.
Wanzl, a German company, makes the majority of shopping trolleys for UK. Apparently each supermarket has specific requirements so, although they look the same, they are not. Can't say I've noticed the difference.