Such immune systems could equally be described as organismic early forms of a feeling for transcendence: thanks to the efficiency of these devices, which are constantly at the ready, the organism actively confronts the potential bringers of its death, opposing them with its endogenous capacity to overcome the lethal. Such functions have earned immune systems of this type comparisons to a 'body police' or border patrol. But as the concern, already at this level, is to work out a modus vivendi with foreign and invisible powers - and, in so far as these can bring death, 'higher' and 'supernatural' ones - this is a preliminary stage to the behaviour one is accustomed to terming religious or spiritual in human contexts. For every organism, its environment is its transcendence, and the more abstract and unknown the danger from that environment, the more transcendent it appears.