"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.

 

1276 books out of 2145 items checked out at 13:00, 09.25.2017

[2145] Total items checked out [0568] Dewey (non-fiction) Books [0708] Non-Dewey (fiction) Books
[1276] Total Books [0840] Media (dvd, cd, etc.) [0006] 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


  59   [741] Drawing + drawings
  39   [641] Food + drink
  27   [305] Social groups
  17   [616] Diseases
  15   [796] Athletic + outdoor sports + games
  11   [158] Applied psychology
  11   [362] Social welfare problems + services
  10   [332] Financial economics
  10   [917] North America
  9   [973] General history of North America United States
  9   [650] Management + auxiliary services
  9   [759] Historical, areas, persons treatment
  9   [808] Rhetoric + collections of literature
  8   [591] Zoology
  8   [155] Differential + developmental psychology
  8   [398] Folklore
  7   [306] Culture + institutions
  7   [613] Promotion of health
  7   [751] Techniques, equipment, forms
  7   [615] Pharmacology + theraputics

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