"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.

1478 books out of 2399 items checked out at 17:00, 01.14.2019

[2399] Total items checked out	[0724] Dewey (non-fiction) Books	[0754] Non-Dewey (fiction) Books
[1478] Total Books	[0836] 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
	138		[741] Drawing + drawings
	39		[641] Food + drink
	28		[973] General history of North America United States
	23		[917] North America
	23		[796] Athletic + outdoor sports + games
	14		[629] Other branches of engineering
	14		[398] Folklore
	13		[158] Applied psychology
	13		[736] Carving + carvings
	12		[599] Mammalia (Mammals)
	10		[364] Criminology
	10		[914] Europe
	9		[979] General history of North America Great Basin + Pacific Slope
	9		[658] General management
	8		[915] Asia
	8		[595] Other invertebrates
	8		[616] Diseases
	8		[428] Standard English usage
	8		[305] Social groups
	8		[811] Poetry