Three halves do not equal any wholes in my case – just three halves: the consequence of my crafting ADHD. I don’t recommend working on more than one or two pairs of socks at a time though, as I’m finding it hard to remember important particulars.
It IS useful to have a couple simultaneous projects of varying degrees of difficulty, for different situations. The middle sock (birthday gift for my friend Caryn) and the one to the right (for Christian) are much easier and faster than the striped one to the left. Worsted wool socks are fast and easy enough to knit while walking around following Christian at the park. Those striped pair require quiet and some concentration, and are perfect for when Christian falls asleep in the car and I’m sitting by myself for a spell.