"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.

2532 books out of 3601 items checked out at 15:00, 01.27.2019

[3601] Total items checked out	[1068] Dewey (non-fiction) Books	[1464] Non-Dewey (fiction) Books
[2532] Total Books	[0901] Media (dvd, cd, etc.)	[0011] 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
	148		[741] Drawing + drawings
	102		[641] Food + drink
	38		[398] Folklore
	21		[973] General history of North America United States
	21		[796] Athletic + outdoor sports + games
	20		[811] Poetry
	18		[305] Social groups
	16		[567] Fossil cold-blooded vertebrates
	16		[635] Garden crops (Horticulture)
	15		[917] North America
	14		[394] General customs
	14		[745] Decorative arts
	14		[158] Applied psychology
	14		[746] Textile arts
	13		[31] General encyclopedic works -- American
	12		[591] Zoology
	12		[914] Europe
	11		[155] Differential + developmental psychology
	11		[613] Promotion of health
	10		[793] Indoor games + amusements