"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.

1214 books out of 1924 items checked out at 17:00, 01.05.2019

[1924] Total items checked out	[0589] Dewey (non-fiction) Books	[0625] Non-Dewey (fiction) Books
[1214] Total Books	[0650] Media (dvd, cd, etc.)	[0007] 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
	200		[741] Drawing + drawings
	46		[641] Food + drink
	15		[613] Promotion of health
	13		[332] Financial economics
	13		[914] Europe
	11		[658] General management
	10		[158] Applied psychology
	9		[649] Child rearing + home care of sick
	8		[796] Athletic + outdoor sports + games
	8		[746] Textile arts
	8		[917] North America
	8		[973] General history of North America United States
	7		[305] Social groups
	7		[612] Human physiology
	7		[398] Folklore
	6		[599] Mammalia (Mammals)
	6		[646] Sewing, clothing, personal living
	6		[153] Mental processes + intelligence
	5		[650] Management + auxiliary services
	5		[793] Indoor games + amusements