A dig through the digital treasures of modern archives can be lots of fun but, sadly, there is seldom time for such a pleasure. While looking through old maps and sketches I came across this and was not sure what to make of it at first. But then it dawned on me and the next lot of sketches really make me go „Wohoo!“. But why? – If I find time tomorrow I will tell you, but as I will have to write a longer post on that I will have to leave you guessing for the moment.