 Busch did not write further illustrated tales for a while , and focused on the literary <unk> des <unk> ( Critique of the Heart ) , wanting to appear more serious to his readers . Contemporary reception for the collection of 81 poems was mainly poor ; it was criticized for its focus on marriage and sexuality . His long @-@ time friend Paul <unk> called it " very serious , heartfelt , charming poems " . Dutch writer Marie Anderson was one of few people who enjoyed his <unk> des <unk> , and even planned to publish it in a Dutch newspaper . 
