he clearly pictured the curls of dark , loamy soil that the plow turned overthe myriad earthworms exposed to sudden unfamiliar and undesired brilliance , the robins following the plow to feast on the worms , the tractor tilted to the left in the previous furrow , the belch of diesel exhaust rising into the clear spring sky , the roar of the engine blurring all other sound into a single seductive drone drawing him into a waking trance .