I'm in the middle of reading 'Flow - The Psychology of Optimal Experience' by Mihaly Csikszentmihalyi. A very interesting book. I love that he did mention about knitting in Flow.
'People were happiest when they were just talking to one another, when they gardened, knitted, or were involved in a hobby; all of these activities require few material resources, but they demand a relatively high investment in psychic energy.'
an excerpt from 'Flow - The Psychology of Optimal Experience' by Mihaly Csikszentmihalyi.