Suggested yarn is a classic fingering yarn 75% wool, 25% nylon - I used Drops Fabel.
2 colours (one ball each) are needed in order to play a real optical effect.
For the largest size you’ll need only 74m from first ball and 197m from second ball.
You can read of Allegro motivetto in my blog: theknittingplanet.blogspot.com

This pattern is free - if you like it and you want to thank me, just pay me a coffee on Paypal (f.caricato at yahoo.it).