After seeing this question, I dropped by your profile and read your hub on UFOs.
I have had a few encounters with 'other-dimensional entities' over the years. Ships of some sort, and beings.
They were all of a positive nature. One was especially joyful and imparted a vision of energetic designs which appear labyrinth-like. I have not seen a UFO with my physical eyes, but have seen UFOs with my inner vision, which were experiences just as real as a physical sighting.
One was at dusk, when with my wife, and we were at Kealakekua Bay, the Place of Refuge on the Kona coast of the Big Island of Hawaii. Kati saw, and I sensed, several UFOs coming up out of the water and shooting upwards into the air at about a 45 degree angle..
Another was when we were at about 10,000 ft elevation on Mount Shasta in northern California, with a small group of people. For me, the 'sighting' was again an inner knowing rather than seeing a physical object. Each person said they saw or sensed the entities, most saw 'ships', one or more saw beings, and the feeling of it to me was other-dimensional. To calm the skeptics, none of us use hallucinogens.
I have no explanation for why people would see the same 'thing' differently, but a theory comes as I type. That is, being of a higher dimension, these particular unidentified objects had behavior with characteristics of the wavicles of quantum mechanics. Now, I just learned about wavicles not too long ago, from a hubber who studied physics. I am not well informed on the subject. But I'll venture to say they can be waves or particles, and can be influenced or may appear differently, according to their observer. So possibly these energetic centers vibrate on such a frequency, and vary in density in an inter-relationship with the observer.
I would be glad to be corrected about this possibility by anyone with more knowledge of what is hypothesized about wavicles.