There are things.
There is no other way to express the first encounter with the world. It may be that this is not the first encounter as such. Perhaps the first encounter is with nothing. But we can never know that. To suggest that nothing can be encountered is counterintuitive and illogical. I too must have been nothing. Nothing cannot be there, for that there would have to be no place.
This world then must be there at the moment of its encounter. What the thing that is encountered matters not for now, only that there is a separation between there and not there.
Space is inferred by the relationship of things.
I cannot make contact with space. It is there only from the sensing of things. Eventually, I will make contact with other things. And space will be inferred from this.
Time is inferred from the change in the relationship of things.
Like space I cannot directly know it. I know time by things and space. The movement of things is the measure of time. I cannot be sure time exists other than from knowing it through things and space.
Reality is the entirety of things, space, and time.
All that can be known is derived from reality.