"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.

1808 books out of 2792 items checked out at 16:00, 01.03.2019

[2792] Total items checked out	[0705] Dewey (non-fiction) Books	[1103] Non-Dewey (fiction) Books
[1808] Total Books	[0886] Media (dvd, cd, etc.)	[0005] 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
	195		[741] Drawing + drawings
	46		[641] Food + drink
	16		[613] Promotion of health
	14		[973] General history of North America United States
	13		[305] Social groups
	12		[811] Poetry
	11		[796] Athletic + outdoor sports + games
	11		[158] Applied psychology
	9		[616] Diseases
	9		[917] North America
	8		[745] Decorative arts
	8		[914] Europe
	8		[591] Zoology
	8		[629] Other branches of engineering
	7		[155] Differential + developmental psychology
	7		[688] Other final products + packaging
	7		[153] Mental processes + intelligence
	7		[303] Social processes
	6		[332] Financial economics
	6		[333] Land economics