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The nineteen century German biologist Ernst Haeckel is famous for his fantastically illustrated book Artforms of Nature. The copyright for this book from 1904 has now expired and thanks to Wikimedia Commons it is available for everyone to...
Yesterday, I received the smallest book of those that I have ever hold in my hands, which is entitled as "Secrets of impossible figures". The dimensions of the book are 3x5 cm. You can compare it's size with a 1 euro coin on the photo above. The book...
