Guillermo spends some time each day applying the principles of structuralism to examine his own conscious experience as carefully as possible. guillermo is engaged in

Guillermo is engaged in "introspection".

Introspection is the examination of one's own cognizant contemplations and emotions. In psychology, the procedure of contemplation depends only on perception of one's psychological state, while in an otherworldly setting it might allude to the examination of one's spirit.