Well it is the beginning of the Fibonacci sequence, where each number is the sum of the previous two: 1+1 = 2, 1+2 =3, 2+3 = 5, 3+5 = 8 and so on.
As you get higher in the sequence, the value a number in the sequence divided by the previous number approaches the golden ratio, which has many, many interesting properties - http://en.wikipedia.org/wiki/Golden_ratio
Well it is the beginning of the Fibonacci sequence, where each number is the sum of the previous two: 1+1 = 2, 1+2 =3, 2+3 = 5, 3+5 = 8 and so on.
As you get higher in the sequence, the value a number in the sequence divided by the previous number approaches the golden ratio, which has many, many interesting properties - http://en.wikipedia.org/wiki/Golden_ratio