"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.

2284 books out of 3456 items checked out at 16:00, 01.20.2019

[3456] Total items checked out	[0990] Dewey (non-fiction) Books	[1294] Non-Dewey (fiction) Books
[2284] Total Books	[1019] Media (dvd, cd, etc.)	[0016] 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
	214		[741] Drawing + drawings
	81		[641] Food + drink
	18		[616] Diseases
	17		[973] General history of North America United States
	17		[914] Europe
	16		[811] Poetry
	16		[796] Athletic + outdoor sports + games
	15		[158] Applied psychology
	14		[635] Garden crops (Horticulture)
	14		[917] North America
	14		[398] Folklore
	14		[613] Promotion of health
	14		[551] Geology, hydrology, meteorology
	13		[612] Human physiology
	12		[332] Financial economics
	12		[306] Culture + institutions
	11		[362] Social welfare problems + services
	10		[303] Social processes
	10		[658] General management
	10		[305] Social groups