"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.

2408 books out of 3504 items checked out at 14:00, 01.06.2019

[3504] Total items checked out	[1064] Dewey (non-fiction) Books	[1344] Non-Dewey (fiction) Books
[2408] Total Books	[0940] Media (dvd, cd, etc.)	[0011] 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
	195		[741] Drawing + drawings
	107		[641] Food + drink
	20		[746] Textile arts
	19		[398] Folklore
	18		[658] General management
	18		[914] Europe
	18		[591] Zoology
	16		[973] General history of North America United States
	15		[523] Specific celestial bodies + phenomena
	15		[158] Applied psychology
	14		[811] Poetry
	13		[613] Promotion of health
	13		[646] Sewing, clothing, personal living
	13		[796] Athletic + outdoor sports + games
	11		[759] Historical, areas, persons treatment
	11		[736] Carving + carvings
	11		[306] Culture + institutions
	11		[332] Financial economics
	10		[155] Differential + developmental psychology
	10		[940] General history of Europe