"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.

1611 books out of 2350 items checked out at 16:00, 06.19.2019

[2350] Total items checked out	[0642] Dewey (non-fiction) Books	[0969] Non-Dewey (fiction) Books
[1611] Total Books	[0646] Media (dvd, cd, etc.)	[0008] 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
	91		[741] Drawing + drawings
	40		[641] Food + drink
	26		[917] North America
	14		[796] Athletic + outdoor sports + games
	13		[158] Applied psychology
	13		[629] Other branches of engineering
	13		[914] Europe
	12		[364] Criminology
	12		[635] Garden crops (Horticulture)
	12		[398] Folklore
	11		[305] Social groups
	11		[599] Mammalia (Mammals)
	10		[940] General history of Europe
	9		[5] Computer programming
	9		[616] Diseases
	9		[791] Public performances
	9		[613] Promotion of health
	8		[636] Animal husbandry
	8		[973] General history of North America United States
	8		[292] Classical (Greek + Roman) religion