... a smaller instance of itself.

... an instance of itself which is "

*structural*- Russian dolls (ie, the outter shell & the rest of the dolls)
- a list (ie, the head of the list & the rest of the list)
- nested rectangles (ie, the outter rectangle & the rest of the rect's)
**interlude**( dragging basics)**interlude**( objectdraw's AngLine class ) - "plant-like" structure ( broccoli )

*numerical/functional*In mathematics, the Fibonacci numbers are the numbers in the following integer sequence:0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...

By definition, the first two Fibonacci numbers are 0 and 1, and each subsequent number is the sum of the previous two. Some sources omit the initial 0, instead beginning the sequence with two 1s.In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation

*F*_{n}= F_{n-1}+ F_{n-2}with seed values

*F*_{0}= 0 and*F*_{1}= 1.