Great question Stingray - I'll look forward to reading some of the answers on this one. Our physical reality is made up of what we perceive with our five senses and then there is our sixth sense intuition - that instinctive knowing or feeling we get about something - even though we can't perceive it with our five senses does it make it less of a reality? Some people are born psychic - they are able to naturally tap into that intuition at a very young age and perceive and pick up on things from another realm. So are the limits for our current physical reality created because our mind sets those limits - the minds of people hundreds of years ago could not comprehend airplanes, computers, cellphones etc., hence those things did not exist. I guess the more openminded we become the more possibility for our physical reality to change and the more we tune in to that Universal Mind - who knows what the limits are.

It sounds as if your premise is that our senses are arbitrarily confined to a narrow spectrum of their possible range.

But our eyes have evolved to see the colors of light that we see, because the vast majority of light output from the sun occurs at those frequencies. Our ears hear the frequencies they do because they are optimized for speech.

In nature, when animals can hear higher frequencies, there is always some specialized use. Bats, for example, hear much higher frequencies than we do, but they use those frequencies for navigation (sonar, essentially).

In theory, we could have evolved senses to observe microwave radiation. But there is no purpose for this. The only natural source for microwave radiation is space, but the atmosphere screens out that radiation, which is why we had to put Hubble in orbit in order to observe it.

After giving this one some thought, I have not been able to come to a valid explanation.

This is a similar question to the one you asked about 'Why are our physical bodies shaped the way they are?'.

I believe that there are an infinite number of universes out there and each one has been created to be different from any other one.

Although I don't believe that our universe is a random mix, I do believe that it has been created to be a mix that is different from the other universes so that the experiences we have (which is our contribution to the universe and how it grows and expands) are different.

So, what I am saying is, I don't think we can look at our universe by itself, but in relation to the whole (which contains everything including all other universes) and from our physical perspective, I believe this is not possible as we are limited by our time and space reality.

So, in a sense, although the answer to your question does exist, we will never be able to understand it from our physical time and space perspective.

what if the way we live is what needs to change; the equipment may be in place but we don't know how to maintain or use it to its capacity. the food and liquid consumed, the air breathed, the thought forms preoccuping our mind if any may be clogging our ability to receive what is out there.