When my dad emailed back, misreading Montaigne in just this way, he nonetheless conceded that the passage I'd sent him was 'thoughtful'. But not, he added 'surprising', as 'Many writers nowadays speak of personal space, meditation, being alone at times, and so on.' He went on to say how there was a difference between voluntary and involuntary solitude. 'Many of us, as we age, become too much involved in that space.' It's not just the confinement but the loss of all able-bodied experience that they're missing out on, and my dad (as ever) listed them: going to the market, dancing, seeing family and friends - precisely the things that Montaigne cautioned his readers not to count on for happiness.