Visions and hallucination are not uncommon in meditation practice. In Zen training we're reminded that the mind generates thoughts and visions like the eyes generate sight, the ears sound and so on… The instruction in that context is not to cling to the vision so that you can return to object-less meditation.
If you are interested in how some of the older meditation traditions view different meditative states, search for Jhana or Dhyana, sentient beings have been doing this for a long time and there is a lot of helpful guidance out there to support your practice.