Overlapping of transparent colored shapes provides several benefits: Reinforcement of focal point; an additional layer of rhythm; direct creation of depth; further enhance of negative space. New Collage Work by Cristiana Couceiro
happy vs. unhappy - I really would like to know who did that becuse this looks like completely shit to me, except for North European Countries (for which i've red real studies). And also, do not mix the quality of life with the happiness, this is basically un-related.
10 BOOK Furniture Design Pieces Every Bookworm Should Have