"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.

0089 books out of 0117 items checked out at 09:00, 01.08.2019

[0117] Total items checked out	[0028] Dewey (non-fiction) Books	[0061] Non-Dewey (fiction) Books
[0089] Total Books	[0028] Media (dvd, cd, etc.)	[0000] 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
	7		[741] Drawing + drawings
	2		[629] Other branches of engineering
	2		[179] Other ethical norms
	1		[347] Civil procedure + courts
	1		[158] Applied psychology
	1		[970] General history of North America
	1		[910] Geography + travel
	1		[301] Sociology + anthropology
	1		[591] Zoology
	1		[977] General history of North America North central United States
	1		[613] Promotion of health
	1		[177] Ethics of social relations
	1		[944] General history of Europe France + Monaco
	1		[241] Moral theology
	1		[294] Religions of Indic origin
	1		[327] International relations
	1		[577] General nature of life
	1		[811] Poetry
	1		[324] The political process
	1		[621] Applied physics