"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.

2446 books out of 3596 items checked out at 16:00, 01.27.2019

[3596] Total items checked out	[1033] Dewey (non-fiction) Books	[1413] Non-Dewey (fiction) Books
[2446] Total Books	[1014] Media (dvd, cd, etc.)	[0017] 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
	141		[741] Drawing + drawings
	78		[641] Food + drink
	22		[796] Athletic + outdoor sports + games
	21		[917] North America
	21		[629] Other branches of engineering
	21		[811] Poetry
	17		[616] Diseases
	17		[158] Applied psychology
	16		[599] Mammalia (Mammals)
	15		[613] Promotion of health
	15		[398] Folklore
	15		[914] Europe
	15		[746] Textile arts
	13		[155] Differential + developmental psychology
	13		[618] Gynecology + other medical specialities
	12		[591] Zoology
	12		[747] Interior decoration
	12		[306] Culture + institutions
	11		[635] Garden crops (Horticulture)
	11		[791] Public performances