"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.

1633 books out of 2538 items checked out at 16:00, 09.19.2017

[2538] Total items checked out	[0744] Dewey (non-fiction) Books	[0889] Non-Dewey (fiction) Books
[1633] Total Books	[0874] Media (dvd, cd, etc.)	[0011] 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
	208		[741] Drawing + drawings
	32		[641] Food + drink
	19		[796] Athletic + outdoor sports + games
	16		[917] North America
	14		[613] Promotion of health
	13		[658] General management
	12		[599] Mammalia (Mammals)
	12		[158] Applied psychology
	11		[728] Residential + related buildings
	11		[643] Housing + household equipment
	11		[650] Management + auxiliary services
	11		[973] General history of North America United States
	9		[591] Zoology
	9		[636] Animal husbandry
	8		[747] Interior decoration
	8		[155] Differential + developmental psychology
	7		[305] Social groups
	7		[635] Garden crops (Horticulture)
	6		[363] Other social problems + services
	6		[152] Perception, movement, emotions, drives