UK.  This is not the place to enter into philosophical debate about what ‘there “be”’ in the real world or, indeed, if anything exists outside human perception. For the moment, we must be satisfied that all empirical evidence comes to us through the senses and thus what ‘there “be”’ is real because we perceive it to be so. This, however, is one of the major stumbling blocks of scientific enquiry. Science demands objectivity and yet, paradoxically, all scientists use their subjective perceptions to perform their scientific work.