"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.

1794 books out of 2629 items checked out at 17:00, 01.23.2019

[2629] Total items checked out	[0757] Dewey (non-fiction) Books	[1037] Non-Dewey (fiction) Books
[1794] Total Books	[0740] 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
	107		[741] Drawing + drawings
	49		[641] Food + drink
	24		[796] Athletic + outdoor sports + games
	21		[917] North America
	18		[398] Folklore
	17		[973] General history of North America United States
	15		[914] Europe
	15		[793] Indoor games + amusements
	14		[305] Social groups
	13		[362] Social welfare problems + services
	12		[613] Promotion of health
	12		[158] Applied psychology
	11		[616] Diseases
	10		[745] Decorative arts
	10		[629] Other branches of engineering
	9		[940] General history of Europe
	9		[599] Mammalia (Mammals)
	9		[791] Public performances
	9		[636] Animal husbandry
	8		[649] Child rearing + home care of sick