Spirals in Nature

Inspired by a photo from the art site Colossal (the first picture with the tennis ball.) [url]http://www.thisiscolossal.com/2013/07/a-golden-spiral-appears-in-a-wet-tennis-ball-photographed-by-arvin-rahimzadeh/[/url] Set the Picture slider to 0 to just play with the spiral, as a graph or a traceable point. Choose a picture to analyze using the slider. Is it a logarithmic spiral? People are always claiming that spirals are golden spirals - logarithmic spirals with a very specific growth constant. What do you think about that? Note: Set b to phi button puts b at that value, not literally at phi! Other images from wikimedia via [url]http://originalbeauty.wordpress.com/2009/06/27/spirals-in-nature/[/url]

 

John Golden

 
Resource Type
Activity
Tags
ball  hurricane  logarithmic  mathart  modeling  nature  nautilus  spiral  sunflower  tennis 
Target Group (Age)
15 – 18
Language
English (United States)
 
 
GeoGebra version
4.2
Views
4069
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