How do we know?

If I just get lost in time
If I plunge into the dark
Would you reach for my hand and pull me back?
 
If I cross the road
If I enter the morning mist
Looking for the light
Would you follow me, nearby?
How do we know what’s real and what’s not
If we never get this close
If we never pull apart
How do we know, if we are morning or night, ocean or land?