"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.

0988 books out of 1862 items checked out at 17:00, 01.18.2019

[1862] Total items checked out	[0465] Dewey (non-fiction) Books	[0523] Non-Dewey (fiction) Books
[0988] Total Books	[0811] Media (dvd, cd, etc.)	[0003] 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
	81		[741] Drawing + drawings
	28		[641] Food + drink
	25		[811] Poetry
	12		[398] Folklore
	12		[808] Rhetoric + collections of literature
	10		[616] Diseases
	8		[917] North America
	8		[914] Europe
	8		[796] Athletic + outdoor sports + games
	7		[940] General history of Europe
	6		[305] Social groups
	6		[155] Differential + developmental psychology
	6		[973] General history of North America United States
	6		[629] Other branches of engineering
	5		[323] Civil + political rights
	5		[577] General nature of life
	5		[362] Social welfare problems + services
	5		[158] Applied psychology
	5		[635] Garden crops (Horticulture)
	5		[649] Child rearing + home care of sick