A hologram allows for something to be considered from all angles, so there is an element of objectivity present when it appears in a dream.
Hologram
Once a product of science fiction, the notion of a hologram has emerged as a possible explanation for the very structure of our universe. As such, in a dream, a hologram may be in the realm of what is known as sacred geometry and could be connecting you to higher wisdom in a spiritual experience. Allow the context of the dream to inform your interpretation.