"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.

1806 books out of 2843 items checked out at 16:00, 09.23.2017

[2843] Total items checked out	[0808] Dewey (non-fiction) Books	[0998] Non-Dewey (fiction) Books
[1806] Total Books	[0987] Media (dvd, cd, etc.)	[0009] 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
	140		[741] Drawing + drawings
	42		[641] Food + drink
	24		[746] Textile arts
	22		[917] North America
	20		[616] Diseases
	17		[158] Applied psychology
	16		[791] Public performances
	15		[745] Decorative arts
	14		[305] Social groups
	13		[31] General encyclopedic works -- American
	13		[613] Promotion of health
	12		[796] Athletic + outdoor sports + games
	11		[658] General management
	11		[599] Mammalia (Mammals)
	10		[636] Animal husbandry
	9		[362] Social welfare problems + services
	9		[306] Culture + institutions
	9		[591] Zoology
	8		[635] Garden crops (Horticulture)
	8		[332] Financial economics