"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.

1524 books out of 2328 items checked out at 14:00, 01.09.2019

[2328] Total items checked out	[0602] Dewey (non-fiction) Books	[0922] Non-Dewey (fiction) Books
[1524] Total Books	[0712] Media (dvd, cd, etc.)	[0006] 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
	112		[741] Drawing + drawings
	49		[641] Food + drink
	13		[616] Diseases
	12		[158] Applied psychology
	12		[973] General history of North America United States
	12		[796] Athletic + outdoor sports + games
	11		[613] Promotion of health
	11		[746] Textile arts
	10		[523] Specific celestial bodies + phenomena
	10		[398] Folklore
	9		[305] Social groups
	9		[979] General history of North America Great Basin + Pacific Slope
	9		[917] North America
	8		[636] Animal husbandry
	8		[567] Fossil cold-blooded vertebrates
	7		[332] Financial economics
	6		[709] Historical, areas, persons treatment
	6		[793] Indoor games + amusements
	6		[362] Social welfare problems + services
	6		[811] Poetry