This is a comparison of 
Renulek's Spring Napkin at round 6 in size 10 and size 20 thread.  I laid the size 20 version on top of the size 10 version.  There's about an inch of difference between the 2 sizes around the edges.  I haven't done anything on the size 10 version since but it will be interesting to see much bigger the 10 thread is than the 20 thread when the doilies are done.
 
I can't imagine how big that will be in size 10! Thanks for the size comparison!
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