Theo van Hoytema is of course famous for its picture book Hoe de vogels aan een Koning kwamen, Het lelijke jonge eendje and Uilengeluk (How the birds came to a King, The Ugly Duckling and The happy owles). But he's also widely known for the calendars that he made between 1902 and 1918: lithographs of animals and birds. In my Friday list you will find nine sheets from 1912 and The happy Owls.