"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.

2783 books out of 3827 items checked out at 16:00, 01.13.2019

[3827] Total items checked out	[1150] Dewey (non-fiction) Books	[1633] Non-Dewey (fiction) Books
[2783] Total Books	[0920] 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
	207		[741] Drawing + drawings
	86		[641] Food + drink
	29		[917] North America
	27		[599] Mammalia (Mammals)
	21		[979] General history of North America Great Basin + Pacific Slope
	21		[613] Promotion of health
	20		[973] General history of North America United States
	19		[746] Textile arts
	19		[811] Poetry
	19		[658] General management
	18		[158] Applied psychology
	18		[305] Social groups
	17		[796] Athletic + outdoor sports + games
	17		[616] Diseases
	15		[629] Other branches of engineering
	15		[306] Culture + institutions
	15		[914] Europe
	15		[618] Gynecology + other medical specialities
	15		[649] Child rearing + home care of sick
	14		[362] Social welfare problems + services