Of all the perplexing things about ‘being’, Heidegger goes on, the most perplexing of all is that people fail to be sufficiently perplexed about it. I say ‘the sky is blue’ or ‘I am happy’, as if the little word in the middle were of no interest. But when I stop to think about it, I realise that it brings up a fundamental and mysterious question. What can it mean to say that anything is?