"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.

1632 books out of 2632 items checked out at 14:00, 01.16.2019

[2632] Total items checked out	[0651] Dewey (non-fiction) Books	[0981] Non-Dewey (fiction) Books
[1632] Total Books	[0881] 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
	113		[741] Drawing + drawings
	47		[641] Food + drink
	20		[616] Diseases
	15		[398] Folklore
	13		[599] Mammalia (Mammals)
	12		[973] General history of North America United States
	11		[305] Social groups
	10		[811] Poetry
	10		[791] Public performances
	9		[591] Zoology
	9		[158] Applied psychology
	9		[613] Promotion of health
	9		[914] Europe
	9		[332] Financial economics
	8		[910] Geography + travel
	7		[612] Human physiology
	7		[821] English poetry
	7		[428] Standard English usage
	6		[796] Athletic + outdoor sports + games
	6		[794] Indoor games of skill