"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.

1666 books out of 2494 items checked out at 11:00, 09.16.2017

[2494] Total items checked out	[0701] Dewey (non-fiction) Books	[0965] Non-Dewey (fiction) Books
[1666] Total Books	[0795] Media (dvd, cd, etc.)	[0007] 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
	121		[741] Drawing + drawings
	38		[641] Food + drink
	19		[811] Poetry
	16		[616] Diseases
	14		[158] Applied psychology
	13		[914] Europe
	13		[629] Other branches of engineering
	13		[398] Folklore
	13		[523] Specific celestial bodies + phenomena
	12		[305] Social groups
	11		[973] General history of North America United States
	11		[940] General history of Europe
	10		[372] Elementary education
	10		[747] Interior decoration
	10		[796] Athletic + outdoor sports + games
	9		[530] Physics
	9		[613] Promotion of health
	8		[306] Culture + institutions
	8		[155] Differential + developmental psychology
	7		[658] General management