"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.

1648 books out of 2603 items checked out at 15:00, 01.16.2019

[2603] Total items checked out	[0683] Dewey (non-fiction) Books	[0965] Non-Dewey (fiction) Books
[1648] Total Books	[0838] Media (dvd, cd, etc.)	[0010] 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
	136		[741] Drawing + drawings
	71		[641] Food + drink
	23		[917] North America
	22		[914] Europe
	16		[811] Poetry
	13		[398] Folklore
	12		[940] General history of Europe
	11		[305] Social groups
	10		[796] Athletic + outdoor sports + games
	10		[599] Mammalia (Mammals)
	10		[745] Decorative arts
	10		[613] Promotion of health
	10		[973] General history of North America United States
	9		[158] Applied psychology
	9		[979] General history of North America Great Basin + Pacific Slope
	9		[616] Diseases
	8		[5] Computer programming
	7		[794] Indoor games of skill
	6		[551] Geology, hydrology, meteorology
	6		[909] World history