"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.

1710 books out of 2669 items checked out at 12:00, 01.12.2019

[2669] Total items checked out	[0776] Dewey (non-fiction) Books	[0934] Non-Dewey (fiction) Books
[1710] Total Books	[0829] Media (dvd, cd, etc.)	[0021] 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
	97		[741] Drawing + drawings
	89		[641] Food + drink
	22		[796] Athletic + outdoor sports + games
	18		[917] North America
	18		[914] Europe
	18		[398] Folklore
	17		[811] Poetry
	16		[973] General history of North America United States
	15		[158] Applied psychology
	13		[613] Promotion of health
	12		[612] Human physiology
	12		[599] Mammalia (Mammals)
	11		[305] Social groups
	9		[745] Decorative arts
	9		[523] Specific celestial bodies + phenomena
	9		[616] Diseases
	8		[618] Gynecology + other medical specialities
	8		[791] Public performances
	8		[5] Computer programming
	7		[688] Other final products + packaging