What Are We Really Seeing?

Illusions.
Delusions.
Hallucinations.

We, as humans, are naturally curious.
Diving into the deepest abyss.
Travelling beyond the stars.
Even making simple observations of everything we see around us.

But what about the things we can't see?
The things in other dimensions.
Other times.
Things on a plane of existence parallel to our own.

At times in our world's history,
The planes have been said to mysteriously merge,
Spilling one into the next.

Some of us humans have claimed to see those things.
From other dimensions
Other times.

Others have brushed them off as plain

Illusions.
Delusions.
Hallucinations.

The brain merely tricking us into thinking we see the things we can't see.

But what if

It's the things we can't see,

Tricking us?