Swirled Flour Pattern on Top of Loaf

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How do you make those swirled flour patterns on top of a loaf?

From what I've read, traditional [url=http://www.pastrychef.com/BANNETON_p_947.html][u]French bannetons[/u][/url] are lined with linen and made from willow.  No pattern is produced because of the linen.  

The brotforms (German tradition) shown at Fantes are made from coiled reed, which causes the pattern in the dough.

I know that most people use either term to describe a proofing basket, but I wonder if there are any recipes which call for specific use of one or the other.  

I don't have a banneton but I do have a brotform.  Applying the Alton Brown multi-tasking philosophy, I can make a linen insert and have the best of both traditions!

 

those look great...not sure I am going to dish out the cash for them, but we'll see.