Professor Guy Claxton
Austin's Butterfly is quite famous. If you haven't seen it, it really is a must (and if you're like me, you've watched it several times over - apart from anything the way the children engage with Ron Berger is gorgeous!)
How about sharing this video with your class to open up a discussion about reflective improvement and craftsmanship? Is there any other way you or your children could think of using this method of reflective improvement? In writing? In maths? In Science? In being kind to others? I think the possibilities are endless ...