"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.

1112 books out of 1765 items checked out at 18:00, 09.19.2017

[1765] Total items checked out	[0590] Dewey (non-fiction) Books	[0522] Non-Dewey (fiction) Books
[1112] Total Books	[0625] Media (dvd, cd, etc.)	[0005] 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
	146		[741] Drawing + drawings
	37		[641] Food + drink
	18		[398] Folklore
	13		[306] Culture + institutions
	13		[917] North America
	12		[613] Promotion of health
	12		[636] Animal husbandry
	12		[616] Diseases
	11		[305] Social groups
	11		[612] Human physiology
	9		[811] Poetry
	9		[973] General history of North America United States
	8		[599] Mammalia (Mammals)
	8		[158] Applied psychology
	7		[746] Textile arts
	7		[745] Decorative arts
	7		[658] General management
	6		[940] General history of Europe
	5		[629] Other branches of engineering
	5		[915] Asia