This challenge by Laura is all about Reticula/ Fragment, two words I hadn't heard before (in combination with zentangle). I don't have the book Zentangle Primer vol. 1 and I didn't get much wiser on internet.
So, I'm just hoping I'm doing the right thing, since I have no clue what F7, R-C3 and A22 are (to name some letters and numbers that apparently mean something ;-) )
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