Husserl’s pupil Martin Heidegger (1889-1976) broke ranks by adding to the phenomena of our awareness the phenomenon of our own existence – our ‘being-in-the-world’ (Dasein) – which he identified with time. For Heidegger our being human is defined by the timescale of our lives, and the need to make them in some sense significant by living ‘authentically’, ie, in recognition of our mortality. This anxious self-awareness and the need to create meaning characterised existentialism as an expression of ‘the meaning of the moment’.