![](http://2.bp.blogspot.com/_WjxBSW9JWRY/SUOv6e8LwTI/AAAAAAAABdY/uu2j3rrwxRg/s400/advent_13.jpg)
Number 13 is a wonderful book, Signs & Emblems by Erhardt Steibner and Dieter Urban, published in 1984.
![](http://4.bp.blogspot.com/_WjxBSW9JWRY/SUPAPQr5rKI/AAAAAAAABdo/wuEzzsCiWZc/s400/signs_symbols.jpg)
I have only ever seen it on blogs and
Flickr groups, but it looks like a great source of inspiration. There's just something nice about a book full of mono graphics and symbols.
![](http://4.bp.blogspot.com/_WjxBSW9JWRY/SUPAPHzSe4I/AAAAAAAABdg/zGNITMJBTLM/s400/signs_symbols_01.jpg)
I have found a few copies of this one for sale
here and
here, but none are what I would call cheap, but I bet it's worth every penny.
https%3A%2F%2Fwww.deliciousindustries.com%2F24-delicious-days-of-advent-13
Delicious+Industries%3A+24+Delicious+Days+of+Advent+-+%2313