¿Que es la indefensión aprendida?

La indefensión aprendida

Cuadros hechos con sellos de fecha.

http://www.thisiscolossal.com/2012/01/date-stamp-paintings-by-federico-pietrella/

Artist Federico Pietrella was born in Rome and now lives and works in Berlin. He creates art using a number of different methods involving resins, flashlights, photocopies, and other found objects, but most striking to me are these lovely paintings made with rubber date stamps. Pietrella opens a exhibition starting this weekend at Galleria Civica G. Segantini in Arco, Italy.