Search IntMath
Close

# Friday math movie: Spirals, Fibonacci, and Being a Plant

By Murray Bourne, 21 Jan 2012

Vi Hart is at it again. In this Doodling in Math video we find out about different kinds of spirals and how Fibonacci numbers can be observed in pine cones, pineapples and artichokes.

This is part 1 of 3 videos on this topic.

As a follow up, blogger MathHombre constructed a GeoGebra file where you can explore the concept of logarithmic spirals. (It takes forever to load, but worth waiting. Move the sliders or click the tiny right arrow at the bottom left of the file to run the animation.)

Logarithmic Spirals in GeoGebra

See also my article on Golden Spirals, a special case of Logarithmic Spirals.

See the 1 Comment below.

### Comment Preview

HTML: You can use simple tags like <b>, <a href="...">, etc.

To enter math, you can can either:

1. Use simple calculator-like input in the following format (surround your math in backticks, or qq on tablet or phone):
a^2 = sqrt(b^2 + c^2)
(See more on ASCIIMath syntax); or
2. Use simple LaTeX in the following format. Surround your math with $$ and $$.
$$\int g dx = \sqrt{\frac{a}{b}}$$
(This is standard simple LaTeX.)

NOTE: You can mix both types of math entry in your comment.