text:  The tenor of his work changed as he developed his style and adapted to his surroundings ( " chameleon @-@ like " according to Watson ) : his earliest works are in a relatively derivative , courtly style , but he came into his own in the years of the rebellion . Owen comments on the " grim simplicity " of the <unk> poems , which mirrors the desert landscape ; the works from his Chengdu period are " light , often finely observed " ; while the poems from the late <unk> period have a " density and power of vision " . 
  