One must imagine Sisyphus happy Thanks for your replies.
I can be very content carrying out a mundane/futile/meaningless task (the struggle), without worrying about trying to achieve something productive (i.e. keeping the rock at the top of the hill).
However, the contentment vanishes when some smartypants suggests a better way to carry out the task. Similarly, in the modern 'To-Do List' scenario of having an almost limitless choice of tasks to perform - i.e. I'm not being compelled to simply roll the rock up the hill, the contentment is lost also. Both scenarios are tied up with the modern obsession of maximising efficiency.
So, I can agree with Albert Camus' conclusion that 'One must imagine Sisyphus happy', but only assuming the absence of (a) people and (b) choice.
Is that a fair summary?