Fibonacci is a sequence of numbers arrived at by adding the previous two numbers together. The first three numbers in the Fibonacci sequence are 1, 1 and 2
1 - (There's nothing before the first number, so you start at 1.)
1 - (There's nothing before the first number, so 1 + 0 = 1)
2 - (1 + 1 = 2)
3 - (2 + 1 = 3)
5 - (3 + 2 = 5)
8 - (5 + 3 = 8)
etc, etc,
For you Tool fans out there, the verse in the song Lateralus actually follows the Fibonacci sequence in syllables, which ascends and descends.
(1) Black,
(1) then,
(2) white are,
(3) all I see,
(5) in my infancy,
(8) red and yellow then came to be,
(5) reaching out to me,
(3) lets me see.
(2) There is,
(1) so,
(1) much,
(2) more and
(3) beckons me,
(5) to look through to these,
(8) infinite possibilities.
(13) As below so above and beyond I imagine,
(8) drawn outside the lines of reason.
(5) Push the envelope.
(3) Watch it bend.