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Two types of rationality On est toujours libre de ne rien
comprendre ` rien—Gabriel Marcel Experimental natural science is
grounded in careful observation. Each investigation must proceed
from observed facts. In physical and biological science these
observed facts are usually inert facts, that is to say they are
grasped from the exterior by an observer who is not disturbed by
them and does not disturb them by his process of observation.
Even in micro-physics where the uncertainty principle tells us
that the observational procedures disturb the field of the
observed there are mathematical techniques which maintain the
observer in some sort of relation of exteriority to the observed
and indeed to his observing techniques themselves. In a science
of personal interaction, on the other hand, mutual disturbance
of the observer and the observed are not only inevitable in
every case but it is