The Tube map is one of my all time favourite design pieces.
So a big thanks to Russell for tipping me off to the London Transport Museum site.
There's loads of interesting visual stuff on the site, including the Top Ten London Underground posters.
The one above by Man Ray is from 1938. Hard to believe it's almost 70 years old.
According to the site, the image is the product of a camera-less photographic process.
This involved placing three-dimensional objects directly onto photographic paper and exposing them to light.
Like I said, hard to believe it's almost 70 years old.
Click here to check out the rest of the Top Ten.