"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.

 

1436 books out of 2291 items checked out at 12:00, 03.23.2019

[2291] Total items checked out [0633] Dewey (non-fiction) Books [0803] Non-Dewey (fiction) Books
[1436] Total Books [0749] Media (dvd, cd, etc.) [0013] 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


  87   [741] Drawing + drawings
  63   [641] Food + drink
  21   [914] Europe
  19   [917] North America
  16   [616] Diseases
  15   [796] Athletic + outdoor sports + games
  14   [895] Literatures of East + Southeast Asia
  13   [973] General history of North America United States
  12   [658] General management
  11   [746] Textile arts
  11   [398] Folklore
  10   [650] Management + auxiliary services
  9   [629] Other branches of engineering
  9   [635] Garden crops (Horticulture)
  9   [791] Public performances
  9   [158] Applied psychology
  8   [332] Financial economics
  8   [305] Social groups
  7   [612] Human physiology
  7   [613] Promotion of health

Hourly Histogram of Circulation Activities

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George Legrady, with Andreas Schlegel and August Black. This active webpage has been operational since October 2005