what defines an observer for reality to exist externally? (refer to Einstein) personally i am not convinced an observer must have conciousness (i am not sure about how Einstein defined it). what is consciousness anyway? i mean i believe i am consciouss, but it seems to me that there are many many levels/states of consciousness, not some generalised consciousness. cliche: if a tree falls in the forest and nobody is present to observe it, does it occur? (something like that ) resulting question: what about the animals in the forest?