"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.

 

0864 books out of 1351 items checked out at 12:00, 06.10.2019

[1351] Total items checked out [0399] Dewey (non-fiction) Books [0465] Non-Dewey (fiction) Books
[0864] Total Books [0422] Media (dvd, cd, etc.) [0002] 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


  34   [641] Food + drink
  18   [741] Drawing + drawings
  12   [306] Culture + institutions
  12   [973] General history of North America United States
  11   [629] Other branches of engineering
  10   [332] Financial economics
  10   [305] Social groups
  8   [811] Poetry
  8   [917] North America
  8   [158] Applied psychology
  8   [658] General management
  7   [363] Other social problems + services
  7   [616] Diseases
  6   [635] Garden crops (Horticulture)
  6   [613] Promotion of health
  6   [155] Differential + developmental psychology
  5   [812] Drama
  5   [597] Cold-blooded vertebrates Fishes
  5   [649] Child rearing + home care of sick
  5   [320] Political science

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