"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.

2259 books out of 3382 items checked out at 13:00, 01.13.2019

[3382] Total items checked out	[1105] Dewey (non-fiction) Books	[1154] Non-Dewey (fiction) Books
[2259] Total Books	[0978] Media (dvd, cd, etc.)	[0014] 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
	206		[741] Drawing + drawings
	100		[641] Food + drink
	33		[973] General history of North America United States
	27		[811] Poetry
	26		[746] Textile arts
	25		[914] Europe
	21		[306] Culture + institutions
	19		[917] North America
	19		[978] General history of North America Western United States
	18		[613] Promotion of health
	15		[305] Social groups
	15		[616] Diseases
	15		[158] Applied psychology
	13		[796] Athletic + outdoor sports + games
	13		[612] Human physiology
	12		[979] General history of North America Great Basin + Pacific Slope
	12		[895] Literatures of East + Southeast Asia
	11		[523] Specific celestial bodies + phenomena
	11		[591] Zoology
	11		[398] Folklore