You might be forgiven for thinking that what you're seeing here is a very well-constructed toy. But it's also a fully operational watt balance, the tool that's used to set the standard measurement of a kilogram.
We have a fascination with Victorian and Edwardian era scientific equipment, and these microscope slides are a perfect example of why. Each slide is housed in a gorgeous paper cover, framing the sample inside.
There is something creepily fascinating about this piece of DiY lab equipment, fashioned in Denmark during the 1970s. Can you guess its purpose? Not for the faint of heart.