"Making Visible the Invisible", a data visualization commissioned by the Seattle Central Library, operational since fall 2005

This database receives by the hour all of the checkouts of books, cds, DVDs, and other material that library patrons take out of the library. The data at the library is classified in two separate categories. Non-fiction items receive a Dewey Classfication System coding, explained here: Dewey Decimal Classes. Fictional items are classified in a different way. This visualization features the top 20 most active Dewey categories. Click on each of the categories to get the chronological list of titles checked out during the previous hour.

1417 books out of 2165 items checked out at 17:00, 01.09.2019

[2165] Total items checked out	[0683] Dewey (non-fiction) Books	[0734] Non-Dewey (fiction) Books
[1417] Total Books	[0663] Media (dvd, cd, etc.)	[0006] Misc

Dewey Decimal Classification Graph

This map highlights current circulating books according to their Dewey classification category in Generalities [0-99]; Philosophy & Psychology[100-199]; Religion [200-299]; Social Science [300-399]; Language [400-499]; Natural Science & Mathematics [500-599]; Technology & Applied Sciences [600-699]; Arts [700-799]; Literature [800-899]; Geography & History [900-999].

			The top 20 Dewey categories
	131		[741] Drawing + drawings
	55		[641] Food + drink
	21		[973] General history of North America United States
	19		[398] Folklore
	14		[914] Europe
	13		[599] Mammalia (Mammals)
	13		[613] Promotion of health
	12		[332] Financial economics
	11		[796] Athletic + outdoor sports + games
	10		[306] Culture + institutions
	10		[155] Differential + developmental psychology
	9		[616] Diseases
	9		[649] Child rearing + home care of sick
	9		[362] Social welfare problems + services
	8		[686] Printing + related activities
	7		[812] Drama
	7		[158] Applied psychology
	7		[305] Social groups
	7		[153] Mental processes + intelligence
	7		[323] Civil + political rights