Barrel Cactus
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Barrel cacti are barrel-shaped plants with large spines at the peaks of protruding structures, or spikes. Some species of this kind of cactus can be easily modeled with a few instructions, as shown in this Demonstration.
Contributed by: Emmanuel Garces Medina (December 2011)
Open content licensed under CC BY-NC-SA
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"Barrel Cactus"
http://demonstrations.wolfram.com/BarrelCactus/
Wolfram Demonstrations Project
Published: December 1 2011