The Hourglass Collection (A timeline through the Art movements) is a reissued series of books, brought together. The series has unique cover illustrations, the color palettes and distinct style from each different art era around the world.
1) The Art Nouveau Style by Alphonse Mucha
2) Art Deco Complete by Alastair Duncan
3) 100 Years of Swiss Graphic design by Lars Muller
The hourglass represent the changes of 3 different 'Design Era' (Art Deco, Art Nouveau and Swiss Style)