Does the idea that the world is a dream, i.e.  a holographic
projection of dimensional realities in a zero dimensional substrate
actuality imply that civilization doesn't exist, or that KP doesn't
exist, or that science doesn't exist, or that anything doesn't exist?

     The conscious experience of the piano is still actual even if the
piano made of wood never was.

     Looking at a conscious experience of a piano and saying 'That's a
piano!' is confusing the symbol with the referent, the map with the
     Are pianos in dreams made of wood?

     Are people in dreams non actual?

     Mine are quite actual.

     How do I know?

     I don't, but then neither do I know presently that YOU are
actual either.

     I do know I am actual.