"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.

0144 books out of 0199 items checked out at 12:00, 06.23.2019

[0199] Total items checked out	[0065] Dewey (non-fiction) Books	[0079] Non-Dewey (fiction) Books
[0144] Total Books	[0052] Media (dvd, cd, etc.)	[0001] 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
	10		[641] Food + drink
	3		[658] General management
	2		[133] Parapsychology + occultism
	2		[158] Applied psychology
	2		[743] Drawing + drawings by subject
	2		[616] Diseases
	2		[613] Promotion of health
	2		[179] Other ethical norms
	2		[891] East Indo-European + Celtic
	2		[736] Carving + carvings
	2		[448] Standard French usage
	1		[892] Afro-Asiatic literatures Semitic
	1		[746] Textile arts
	1		[782] Vocal music
	1		[332] Financial economics
	1		[294] Religions of Indic origin
	1		[615] Pharmacology + theraputics
	1		[709] Historical, areas, persons treatment
	1		[309] Not assigned or no longer used
	1		[897] North American native literatures