One of the most difficult theosophical concepts to explain is that of 'Maya'. Blavatsky only refers
to it in passing, but it's an important part of Vedanta philosophy.
Basically (but I'm sure I'm simplifying as usual) it's the idea that everything we see is an illusion brought about by Shiva (or consciousness perhaps?).
In Buddhism the doctrine of Sunyata
is similarly illusive. It's not quite nihilistic, but it does imply that everything is empty of permanent self. In other words: everything changes...
So - are these the same thing?