"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.

1961 books out of 3165 items checked out at 15:00, 01.19.2019

[3165] Total items checked out	[0907] Dewey (non-fiction) Books	[1054] Non-Dewey (fiction) Books
[1961] Total Books	[1104] Media (dvd, cd, etc.)	[0012] 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
	167		[741] Drawing + drawings
	70		[641] Food + drink
	22		[398] Folklore
	20		[613] Promotion of health
	20		[917] North America
	19		[796] Athletic + outdoor sports + games
	17		[595] Other invertebrates
	16		[914] Europe
	15		[811] Poetry
	14		[616] Diseases
	14		[973] General history of North America United States
	13		[746] Textile arts
	13		[305] Social groups
	12		[940] General history of Europe
	11		[646] Sewing, clothing, personal living
	10		[155] Differential + developmental psychology
	10		[635] Garden crops (Horticulture)
	9		[599] Mammalia (Mammals)
	9		[747] Interior decoration
	9		[332] Financial economics