"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.

1374 books out of 2184 items checked out at 16:00, 01.18.2019

[2184] Total items checked out	[0556] Dewey (non-fiction) Books	[0818] Non-Dewey (fiction) Books
[1374] Total Books	[0726] Media (dvd, cd, etc.)	[0007] 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
	120		[741] Drawing + drawings
	38		[641] Food + drink
	21		[398] Folklore
	18		[811] Poetry
	14		[746] Textile arts
	12		[158] Applied psychology
	11		[745] Decorative arts
	10		[305] Social groups
	10		[914] Europe
	9		[306] Culture + institutions
	9		[917] North America
	8		[155] Differential + developmental psychology
	7		[323] Civil + political rights
	7		[973] General history of North America United States
	7		[940] General history of Europe
	7		[567] Fossil cold-blooded vertebrates
	6		[507] Education, research, related topics
	6		[808] Rhetoric + collections of literature
	6		[332] Financial economics
	6		[613] Promotion of health