"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.

2012 books out of 3204 items checked out at 15:00, 01.26.2019

[3204] Total items checked out	[0896] Dewey (non-fiction) Books	[1116] Non-Dewey (fiction) Books
[2012] Total Books	[1044] Media (dvd, cd, etc.)	[0019] 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
	128		[741] Drawing + drawings
	65		[641] Food + drink
	24		[914] Europe
	20		[917] North America
	19		[306] Culture + institutions
	19		[158] Applied psychology
	16		[796] Athletic + outdoor sports + games
	15		[658] General management
	14		[591] Zoology
	14		[332] Financial economics
	13		[613] Promotion of health
	13		[612] Human physiology
	12		[636] Animal husbandry
	12		[155] Differential + developmental psychology
	11		[973] General history of North America United States
	10		[791] Public performances
	10		[895] Literatures of East + Southeast Asia
	10		[551] Geology, hydrology, meteorology
	10		[616] Diseases
	9		[372] Elementary education