(as) round as Giotto's O

(as) round as Giotto's O

Quickly yet perfectly done. The phrase refers to the Italian artist Giotto, who is said to have promptly drawn a perfect circle to demonstrate his artistic abilities for Pope Boniface VIII. Wow, I can't believe you wrote this paper in one night—your writing is round as Giotto's O.
See also: round
Farlex Dictionary of Idioms.
See also:
  • a woman's work is never done
  • an ugly duckling
  • be in the black
  • blast (someone or something) to kingdom come
  • be below the belt
  • below the belt, hit
  • below the belt
  • famous last words
  • get (something) over with
  • get it over with