I shall tell you a story about the most perfect snowball I have ever seen:
My brother was walking to the mall, and making a snowball meanwhile.
When he got there he parked the ball in a pile of snow and retrieved it afterwards, continuing its making all the way home.
When he got home he showed it to me,
and it looked like a ping-pong ball. Completely smooth, not even "snow-rough" but plastic smooth, small and hard as ice.
And then he threw it and missed.
Anticlimactic, but hey, it was a nice ball.