"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.

1797 books out of 2739 items checked out at 17:00, 01.10.2019

[2739] Total items checked out	[0902] Dewey (non-fiction) Books	[0895] Non-Dewey (fiction) Books
[1797] Total Books	[0847] 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
	133		[741] Drawing + drawings
	61		[641] Food + drink
	41		[796] Athletic + outdoor sports + games
	26		[398] Folklore
	21		[914] Europe
	18		[646] Sewing, clothing, personal living
	18		[305] Social groups
	17		[613] Promotion of health
	17		[158] Applied psychology
	17		[746] Textile arts
	16		[973] General history of North America United States
	16		[629] Other branches of engineering
	14		[577] General nature of life
	13		[745] Decorative arts
	12		[782] Vocal music
	12		[747] Interior decoration
	12		[811] Poetry
	12		[791] Public performances
	10		[658] General management
	10		[155] Differential + developmental psychology