Concentration:
How this is concentration is that there are leaves going to a certain point until the cross and make a concentrated area.
Isolation:
How this is isolation is that I made all of the leaves touch each other, except for one leaf.
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You have an interesting style for sure, I like the sketchiness of the leaves. Your 2nd design is strong. Keep up the good work! Check out my blog if you have the time…
http://blog.scad.edu/wiball21/2013/01/17/concentrate-isolate/