i thought of this thread when i happened to pick up doublegun journal 2010 - #3, and reread jack rowe's article "how to identify & describe fences"; wherein, he identifies four basic shapes of fences.

plain ball, long and short
cutaway
ball and bead
ball, bead and cutaway

article is on page 131 if you're so inclined.

best regards,
tom

"it's a poor sort of memory that only works backwards."
lewis carroll, Alice in Wonderland