"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.

2177 books out of 3367 items checked out at 13:00, 01.20.2019

[3367] Total items checked out	[0965] Dewey (non-fiction) Books	[1212] Non-Dewey (fiction) Books
[2177] Total Books	[1034] 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
	133		[741] Drawing + drawings
	89		[641] Food + drink
	24		[973] General history of North America United States
	23		[613] Promotion of health
	23		[914] Europe
	21		[796] Athletic + outdoor sports + games
	19		[158] Applied psychology
	18		[323] Civil + political rights
	17		[398] Folklore
	16		[811] Poetry
	14		[910] Geography + travel
	14		[917] North America
	13		[616] Diseases
	13		[746] Textile arts
	13		[635] Garden crops (Horticulture)
	12		[31] General encyclopedic works -- American
	12		[612] Human physiology
	11		[155] Differential + developmental psychology
	10		[891] East Indo-European + Celtic
	10		[791] Public performances