"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.

2237 books out of 3431 items checked out at 16:00, 01.02.2019

[3431] Total items checked out	[0977] Dewey (non-fiction) Books	[1260] Non-Dewey (fiction) Books
[2237] Total Books	[1055] Media (dvd, cd, etc.)	[0009] 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
	244		[741] Drawing + drawings
	56		[641] Food + drink
	30		[158] Applied psychology
	20		[305] Social groups
	19		[616] Diseases
	16		[745] Decorative arts
	16		[973] General history of North America United States
	15		[591] Zoology
	14		[917] North America
	13		[914] Europe
	13		[398] Folklore
	13		[306] Culture + institutions
	12		[613] Promotion of health
	12		[811] Poetry
	10		[551] Geology, hydrology, meteorology
	10		[612] Human physiology
	10		[796] Athletic + outdoor sports + games
	10		[940] General history of Europe
	10		[599] Mammalia (Mammals)
	10		[915] Asia