Judaism teaches that while standing at Mount Sinai the Jewish people shared a collective prophetic experience. Many would typically expect prophecy to be a unique individual experience, a kind of private session with the Creator. So how did the experience become so collective, especially to the extent of allowing a vast population to pretty much share the exact same prophecy?
Perhaps, this question can be answered by asking it in the reverse direction; namely, how do humans share a collective earthly experience? My answer is because we're all souls who are invested in our earthly bodies more or less to the same extent.
So then what happens when we divest from our earthly bodies more or less to the same extent? Collective prophecy!