"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.

2429 books out of 3389 items checked out at 15:00, 01.13.2019

[3389] Total items checked out	[1012] Dewey (non-fiction) Books	[1417] Non-Dewey (fiction) Books
[2429] Total Books	[0818] Media (dvd, cd, etc.)	[0013] 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
	175		[741] Drawing + drawings
	97		[641] Food + drink
	22		[158] Applied psychology
	19		[973] General history of North America United States
	18		[398] Folklore
	17		[746] Textile arts
	16		[658] General management
	16		[306] Culture + institutions
	15		[917] North America
	14		[811] Poetry
	14		[577] General nature of life
	13		[394] General customs
	13		[796] Athletic + outdoor sports + games
	12		[914] Europe
	12		[305] Social groups
	11		[629] Other branches of engineering
	11		[155] Differential + developmental psychology
	11		[362] Social welfare problems + services
	11		[599] Mammalia (Mammals)
	11		[5] Computer programming