 The poem incorporates a complex reliance on assonance — the repetition of vowel sounds — in a conscious pattern , as found in many of his poems . Such a reliance on assonance is found in very few English poems . Within " Ode to a Nightingale " , an example of this pattern can be found in line 35 ( " Already with thee ! tender is the night " ) , where the " <unk> " of " Already " connects with the " e " of " tender " and the " i " of " with " connects with the " i " of " is " . This same pattern is found again in line 41 ( " I cannot see what flowers are at my feet " ) with the " a " of " cannot " linking with the " a " of " at " and the " ee " of " see " linking with the " ee " of " feet " . This system of assonance can be found in approximately a tenth of the lines of Keats 's later poetry . 
