Tyger Tyger, burning bright,
In the forests of the night;
What immortal hand or eye,
Could frame thy fearful symmetry?
'Eye' and 'symmetry' don't rhyme in modern standard English. But pronunciation can shift over 200+ years. How would those two words have been spoken by Blake himself?
'Eye is sometimes pronounced as 'ee' in Scottish dialect, which would be a proper rhyme. Would Blake have said it that way?