"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.

1551 books out of 2601 items checked out at 17:00, 01.12.2019

[2601] Total items checked out	[0692] Dewey (non-fiction) Books	[0859] Non-Dewey (fiction) Books
[1551] Total Books	[0967] Media (dvd, cd, etc.)	[0022] 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
	114		[741] Drawing + drawings
	65		[641] Food + drink
	19		[398] Folklore
	19		[745] Decorative arts
	16		[811] Poetry
	16		[599] Mammalia (Mammals)
	13		[973] General history of North America United States
	13		[746] Textile arts
	13		[917] North America
	11		[332] Financial economics
	10		[796] Athletic + outdoor sports + games
	9		[158] Applied psychology
	9		[914] Europe
	9		[305] Social groups
	8		[895] Literatures of East + Southeast Asia
	8		[153] Mental processes + intelligence
	8		[615] Pharmacology + theraputics
	8		[616] Diseases
	7		[613] Promotion of health
	7		[612] Human physiology