"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.

0758 books out of 1274 items checked out at 12:00, 01.07.2019

[1274] Total items checked out	[0331] Dewey (non-fiction) Books	[0427] Non-Dewey (fiction) Books
[0758] Total Books	[0449] 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
	43		[741] Drawing + drawings
	31		[641] Food + drink
	10		[917] North America
	10		[759] Historical, areas, persons treatment
	9		[398] Folklore
	9		[973] General history of North America United States
	7		[746] Textile arts
	7		[378] Higher education
	6		[394] General customs
	6		[613] Promotion of health
	5		[812] Drama
	5		[133] Parapsychology + occultism
	5		[629] Other branches of engineering
	5		[796] Athletic + outdoor sports + games
	4		[294] Religions of Indic origin
	4		[362] Social welfare problems + services
	4		[747] Interior decoration
	4		[616] Diseases
	4		[895] Literatures of East + Southeast Asia
	4		[914] Europe