The truth is this: There is no truth. Everything in our lives is perception. What one person perceives may not be what another person sees.
Colors, tastes, light/darkness, temperature; EVERYTHING in existence is ALL based purely off of one's own perception.
From the exact moment that we first open our eyes to the present second, our minds do not fully understand everything around us. Our brains purposely block sensory signals sent to us from different stimuli in our environment.
In example, you heard of selective hearing? There's selective seeing, selective smelling, selective tasting...
We have absolutely NO idea what our brains are not showing us.
To sum this up, and to not take this in too far of an alternate direction, but whether the existence of aliens/God/other-worldly forces could be seen or not, can you imagine if we were able to hit the "Reset Button"?
Can you imagine what just one second of our life would be like if we were able to completely and fully see, hear, feel and perceive every single thing around us?
We would not be able to control it, which is why we don't see these things to begin with....