Sure, Jessie!
A FIB is based on the Fibonacci Series in math. It starts with 1, 1 -- and then each subsequent number is the sum of the previous two numbers. So, the Series is:
1, 1, 2, 3, 5, 8
And actually the series goes on. But the FIB stops with 8.
The rules, then, are that the lines in the FIB have one, one, two, three, five, and eight syllables.
This
here
is an
example
of a FIB, but not
a very good one, seems to me.
OK? Hope this helps.
Warmly, Aunt Bobby