The video here shows one of Szymon Klimek's incredible miniature brass sculptures. the sculpture measures 11.5cm x 9cm x 7cm. Though that is quite small, it is larger than much of Klimek's works -- many will fit inside of a wine glass. As with most of his pieces, the delicate metalwork is driven by small integrated solar panels. I'd love to see him putting one of these tiny model engines together. It would probably very educational!
See more miniature kinetic sculptures in brass by Szymon Klimek on his web site.