"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.

2422 books out of 3498 items checked out at 15:00, 01.06.2019

[3498] Total items checked out	[1187] Dewey (non-fiction) Books	[1235] Non-Dewey (fiction) Books
[2422] Total Books	[0950] Media (dvd, cd, etc.)	[0018] 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
	202		[741] Drawing + drawings
	129		[641] Food + drink
	38		[973] General history of North America United States
	30		[598] Aves (Birds)
	28		[746] Textile arts
	19		[917] North America
	18		[796] Athletic + outdoor sports + games
	17		[158] Applied psychology
	17		[616] Diseases
	17		[613] Promotion of health
	17		[599] Mammalia (Mammals)
	17		[394] General customs
	15		[646] Sewing, clothing, personal living
	15		[811] Poetry
	14		[305] Social groups
	14		[747] Interior decoration
	14		[306] Culture + institutions
	13		[649] Child rearing + home care of sick
	13		[398] Folklore
	12		[745] Decorative arts