all action aims at getting something that we feel the want of, 
or of creating something that does not yet exist.
in this very special sense, it fills a void, and goes from the empty to the full,
from an absence to a presence, from the unreal to the real. 
now the unreality which is here in question is purely relative to 
the direction in which our attention is engaged, for we
are immersed in realities and cannot pass out of them, only if 
we pass out of them, only if the present reality is not the one 
we are seeking, we speak of the absence of this sought-for reality
wherever we find the presence of another.
we thus express what we have as a function of what we want.



henri bergson's creative evolution