"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.

2252 books out of 3485 items checked out at 13:00, 01.06.2019

[3485] Total items checked out	[1040] Dewey (non-fiction) Books	[1212] Non-Dewey (fiction) Books
[2252] Total Books	[1009] Media (dvd, cd, etc.)	[0024] 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
	143		[741] Drawing + drawings
	119		[641] Food + drink
	23		[613] Promotion of health
	20		[917] North America
	19		[973] General history of North America United States
	19		[616] Diseases
	19		[158] Applied psychology
	18		[305] Social groups
	17		[306] Culture + institutions
	17		[796] Athletic + outdoor sports + games
	15		[398] Folklore
	15		[636] Animal husbandry
	14		[362] Social welfare problems + services
	13		[793] Indoor games + amusements
	12		[599] Mammalia (Mammals)
	12		[791] Public performances
	12		[323] Civil + political rights
	11		[650] Management + auxiliary services
	11		[513] Arithmetic
	11		[746] Textile arts