The same things aren't the same. 
We can't know the whole picture of the world

because we can't see its front and back at the same time.

As time passes, we forget what we've seen.

Also, we can't be sure that the world exists as a truth. 

We don't find the same meaning even when we see the same things.

Though we may seem to have common values, we're actually projecting our experiences onto the world through a personal filter. We don't see what's visible, and we see what's not. 

For me, the acts of drawing and erasing, existence and a blank space, all hold the same value. 

Still, I'll undoubtedly find the answer for the sake of the world's continuous memories.