The experience of physicality and time. Experiencing this two like they are real is one of the miracle of this reality.
Physicality:
"Physicists tell us that the solidity of matter is an illusion. Even seemingly solid matter, including your physical body, is nearly 100 percent empty space — so vast are the distances between the atoms compared to their size. What is more, even inside every atom there is mostly empty space.". When we were to zoom in on a solid object, we would see that it is mostly made up of nothing. So, in a sense, the solidity of matter is an illusion, therefore there's no physical reality, no physical body and no physical brain (what some believe holds consciousness). Form is formless.
Time:
"Time is basically an illusion created by the mind to aid in our sense of temporal presence in the vast ocean of space. Without the neurons to create a virtual perception of the past and the future based on all our experiences, there is no actual existence of the past and the future. All that there is, is the present.". There's no actual future or past, there's only now, the eternal now, where all things exist simultaneously.
Our time-space reality is clearly not real and yet we get to experience it as if it were, this is a mind bend, a miracle to witness unfold.