"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.

1830 books out of 2833 items checked out at 13:00, 07.16.2017

[2833] Total items checked out	[0841] Dewey (non-fiction) Books	[0989] Non-Dewey (fiction) Books
[1830] Total Books	[0952] Media (dvd, cd, etc.)	[0011] 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
	192		[741] Drawing + drawings
	44		[641] Food + drink
	21		[616] Diseases
	20		[796] Athletic + outdoor sports + games
	17		[613] Promotion of health
	16		[305] Social groups
	15		[917] North America
	13		[635] Garden crops (Horticulture)
	13		[914] Europe
	12		[398] Folklore
	11		[507] Education, research, related topics
	11		[895] Literatures of East + Southeast Asia
	11		[940] General history of Europe
	11		[362] Social welfare problems + services
	10		[818] Miscellaneous writings
	10		[746] Textile arts
	10		[919] Other areas
	10		[811] Poetry
	9		[791] Public performances
	8		[793] Indoor games + amusements