The line 'According to Brueghel' indicates that the poet based the poem on a painting by Pieter Brueghel the Elder.
According to Brueghel, the line from the poem shows that the poet based the poem on a painting. The painting referenced in the poem is 'Landscape with the Fall of Icarus' by Pieter Brueghel the Elder, which depicts the tragic myth of Icarus falling to earth after flying too close to the sun. The poem and the painting share themes of human labor and the idea that life goes on despite individual tragedies.