Have you been to the Tate Modern recently? Underfoot as many people rush across the Millennium Bridge are miniature artworks, most being between 25-40mm wide.
These are relatively new as you can see from the 2014 and 2015 dates on a few. They represent all sorts of stories, cultures and nationalities.
Bright, detailed and colourful and shot in a low winter sunlight each one of these is remarkable.