"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.

0213 books out of 0317 items checked out at 17:00, 01.13.2019

[0317] Total items checked out	[0082] Dewey (non-fiction) Books	[0131] Non-Dewey (fiction) Books
[0213] Total Books	[0101] Media (dvd, cd, etc.)	[0000] 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
	11		[741] Drawing + drawings
	6		[641] Food + drink
	4		[5] Computer programming
	4		[658] General management
	4		[305] Social groups
	3		[647] Management of public households
	3		[919] Other areas
	3		[398] Folklore
	3		[613] Promotion of health
	2		[668] Technology of other organic products
	2		[523] Specific celestial bodies + phenomena
	2		[628] Sanitary + municipal engineering
	2		[914] Europe
	2		[6] Special computer methods
	2		[650] Management + auxiliary services
	1		[661] Industrial chemicals technology
	1		[708] Galleries, museums, private collections
	1		[302] Social interaction
	1		[303] Social processes
	1		[777] Not assigned or no longer used