What is mind? What is matter? Never mind. It doesn’t matter.
The Holographic universe suggests that the physical world we believe to be real is in fact illusion. Energy fields are decoded by our brains into a 3D picture, to give the illusion of a physical world.
The perceptions we observe may well be coming from an artificial source. Suppose we could take our brain out of our body and keep it alive in a glass jar. Put a computer in which all kinds of information can be recorded. Transmit the electrical signals of all the data related to a setting such as image, sound and smell into this computer. Connect this computer to the sensory centers in our brain with electrodes and send the pre-recorded data to our brain. As our brain perceives these signals it will see and live the setting correlated with these.