What is a simile in the poem Dream Variations by Langston Hughes?

The shift in "Dreams Deferred" occurs right before the last line of the poem. Before the last line, Hughes compares dreams to other objects using detailed similes, and the comparisons usually take a while to occur (i.e. The drying of a raisin in the sun and the spoiling of meat). The last line, however, compares dreams to something short that happens quickly, and Hughes uses no poetic devices.