I
still can't visualize the crystal ball after two meditation sessions
That is not
unusual because sometimes different people take different lengths
of time at first to see the crystal ball. It doesn't mean that
you have made no progress, because it's not the crystal ball which
is our real aim in meditation. What we really aim for is peace
and happiness, isn't it? Pay attention to the centre of the body
and keep the awareness there. The longer and more continuously
you keep your mind there, the more happiness and peace you will
create. Finally, the crystal ball will come, and you can pass
through this state into a higher one.