"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.

2516 books out of 3845 items checked out at 16:00, 01.12.2019

[3845] Total items checked out	[1052] Dewey (non-fiction) Books	[1464] Non-Dewey (fiction) Books
[2516] Total Books	[1228] Media (dvd, cd, etc.)	[0006] 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
	222		[741] Drawing + drawings
	75		[641] Food + drink
	34		[914] Europe
	23		[613] Promotion of health
	22		[398] Folklore
	22		[796] Athletic + outdoor sports + games
	20		[332] Financial economics
	20		[616] Diseases
	18		[305] Social groups
	17		[746] Textile arts
	16		[811] Poetry
	14		[158] Applied psychology
	13		[973] General history of North America United States
	13		[791] Public performances
	12		[745] Decorative arts
	11		[636] Animal husbandry
	11		[782] Vocal music
	11		[917] North America
	10		[306] Culture + institutions
	10		[591] Zoology