I date my personal experiences with multiple aspects from way back in the past when i didn't actually interpret it as such at the time. for example, i went through a phase when i had a more religious perspective, and i remember having a dream in which i met a girl, where the connection felt so deep and complete that when i woke-up, i chose to interpret it as an encounter with a female aspect of god. I also used to prey a lot as well, and after this dream, i distinctively remember choosing to integrate imagination and visualization in my prayer sessions; specifically to re-create this girl 'character' using the same details as inspired from the dream, but allowing new scenarios. Because these sessions were making me feel as good and inspired as the actual initial dream, i remember choosing to interpret these imagined scenarios as representing something real and valid happening in parallel (like i had interpreted the dream). The symbol lost its strong emotional quality after just a few days, so i just stopped thinking about it or practice it at the time.
It's only many years later that things crystallized for me, and remembering this experience helped me come to the conclusion that this multiple aspect had been there all along. It was just a matter of perceptive of what is reel and what is 'illusion' and that the feeling of the presence of another person is always reel even if it is not quantified physically in 'flesh'.
There's no reason for me to wait for one of those exceptional dreams to happen every 2 years to get a template for persons to visualize. (and for it to last only a few days).. Now, I allow these visualizations to be based on any experience of people that leave a strong impression on me (even if these come from arts & media). These visualizations are also much more regular, casual and integrated in the day to day for me now.