"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.

1270 books out of 1995 items checked out at 17:00, 01.15.2019

[1995] Total items checked out	[0584] Dewey (non-fiction) Books	[0686] Non-Dewey (fiction) Books
[1270] Total Books	[0631] 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
	94		[741] Drawing + drawings
	46		[641] Food + drink
	20		[796] Athletic + outdoor sports + games
	18		[398] Folklore
	17		[305] Social groups
	16		[158] Applied psychology
	11		[973] General history of North America United States
	11		[811] Poetry
	10		[658] General management
	10		[791] Public performances
	9		[917] North America
	8		[613] Promotion of health
	7		[616] Diseases
	7		[306] Culture + institutions
	7		[794] Indoor games of skill
	7		[618] Gynecology + other medical specialities
	7		[332] Financial economics
	7		[612] Human physiology
	6		[746] Textile arts
	6		[428] Standard English usage