This is a compendium of two biodegradable pens, bought on January 28th 2010.
The purple pen belongs to Jessica while the yellow pen was mine.
The pens were created with the purpose of decomposing within one year.
As we didn't believe on this fact we kept a daily compendium on the deterioration
and monthly animations to see the progress at work.
See the daily process at http://decompendium.tumblr.com