"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.

0085 books out of 0195 items checked out at 17:00, 06.16.2019

[0195] Total items checked out	[0038] Dewey (non-fiction) Books	[0047] Non-Dewey (fiction) Books
[0085] Total Books	[0105] 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
	8		[741] Drawing + drawings
	3		[917] North America
	2		[811] Poetry
	2		[282] Roman Catholic Church
	2		[759] Historical, areas, persons treatment
	1		[635] Garden crops (Horticulture)
	1		[230] Christian theology
	1		[25] Library operations
	1		[972] General history of North America Middle America Mexico
	1		[153] Mental processes + intelligence
	1		[332] Financial economics
	1		[791] Public performances
	1		[306] Culture + institutions
	1		[617] Surgery + related medical specialities
	1		[940] General history of Europe
	1		[428] Standard English usage
	1		[809] Literary history + criticism
	1		[323] Civil + political rights
	1		[529] Chronology
	1		[843] French fiction