Science isn't my strong point (I'm still in awe of the fact that music can emerge from a thin silver disc...) so it's probably better that I direct you to the Wikipedia article on Fibonacci numbers.
Not that you have to read it to write a Fibonacci poem though. Here are the basics:
The first number of the sequence is 0, the second number is 1, and each subsequent number is equal to the sum of the previous two numbers of the sequence itself, yielding the sequence 0, 1, 1, 2, 3, 5, 8, etc.
So a Fibonnaci poem is made up of 6 lines as follows:
And what's the point, you might ask?
Well, with any strict form, it gives the left-hand side of the brain something to fuss over (order) while the right-hand side of the brain can play a little.
I played with this:
shakes the house.
This morning sunlight
through the palm crowns like a blessing.
Maybe it's not enough... too much description, not enough significance? But it's a good exercise to encourage you to choose words that really matter, words that have to try and carry as much weight and information as possible.
And I'm sure you'll come up with some better ones.