"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.

1316 books out of 1967 items checked out at 11:00, 01.22.2019

[1967] Total items checked out	[0508] Dewey (non-fiction) Books	[0808] Non-Dewey (fiction) Books
[1316] Total Books	[0543] 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
	41		[741] Drawing + drawings
	36		[641] Food + drink
	23		[613] Promotion of health
	15		[398] Folklore
	14		[332] Financial economics
	14		[599] Mammalia (Mammals)
	11		[305] Social groups
	11		[973] General history of North America United States
	10		[598] Aves (Birds)
	9		[811] Poetry
	8		[796] Athletic + outdoor sports + games
	8		[629] Other branches of engineering
	8		[551] Geology, hydrology, meteorology
	7		[616] Diseases
	7		[372] Elementary education
	7		[917] North America
	7		[591] Zoology
	7		[155] Differential + developmental psychology
	7		[294] Religions of Indic origin
	6		[394] General customs