"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.

1463 books out of 2268 items checked out at 16:00, 01.08.2019

[2268] Total items checked out	[0719] Dewey (non-fiction) Books	[0744] Non-Dewey (fiction) Books
[1463] Total Books	[0728] Media (dvd, cd, etc.)	[0002] 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
	122		[741] Drawing + drawings
	40		[641] Food + drink
	33		[398] Folklore
	20		[914] Europe
	16		[796] Athletic + outdoor sports + games
	15		[917] North America
	13		[629] Other branches of engineering
	13		[973] General history of North America United States
	12		[979] General history of North America Great Basin + Pacific Slope
	12		[635] Garden crops (Horticulture)
	11		[158] Applied psychology
	9		[613] Promotion of health
	9		[746] Textile arts
	8		[306] Culture + institutions
	7		[591] Zoology
	7		[811] Poetry
	7		[616] Diseases
	6		[658] General management
	6		[646] Sewing, clothing, personal living
	6		[793] Indoor games + amusements