What is time? What is space?

[anagogy]

What about the concept of spacetime, in physics, being one substance?

They are the same substance. Picture a mobius strip where one side is mind and the other side is matter, the distance between them is only vibrational. It is the same distinction between space and time. Same manifestation, one is just inner, and the other outer.

My point is that time is only an illusory veil because, in the end, perception is based on space in unison with its change, change not being a seperate substance, only a mental concept describing the change of space.

What do we have in conscious timelessness?

Simply, I disagree with the idea of time being the original substance. Time does not exist without space. Space is experience in any case with a lack of time only being everything perceived at once.

From my perspective the original substance is consciousness. When a self, or ego, forms in this beingness, then the distinction between the inner realm of time, and the outer realm of space are born.