Many physical phenomena, such as protons, electrons and even the abovementioned time and space, are nothing other than a name for a lack of knowledge. We know that there is something, but we have no idea what it is, so we just give it a name in order to discuss it or remember it. On this basis it would not be at all surprising (and perhaps very likely) if there is a parallel world (parallel with our one) which may be detectable. Just to give a simple example, it may happen that there is a garden where we are sitting, where we smell the flowers and listen to the dancing leaves sigh in the wind. Then there is another place, a parallel dimension, a perfect replica of where we are here, and in that parallel world’s garden other people are living and listening to the dancing leaves sigh in the wind. We are simply not developed enough to see that other parallel dimension.

Can it exist, what we cannot perceive?
In scientific research physicists do not accept anything until they can satisfactorily demonstrate or prove it. Therefore only a thin slice of the existing world is used in the scientific process, and there is an unpredictable range of things which do exist but cannot be proven or detected by scientific instruments.
Is it possible that mediums (i.e. astrologers, psychics and clairvoyants) have progressed far ahead in their spiritual development? Because they are able to sense or detect, besides the existing world, other dimensions (both past and future). And because the soul does not know the past nor the future, but rather everything that is happening now in the present. So future predictions or connections with deceased persons may possibly be considered as perceptions of parallel dimensions.
Beings in Higher Dimensions
Time and space are different in other dimensions, different from what we perceive in our world. Angels, spirits and other beings who exist in different dimensions exist on other mental levels. The higher the level of consciousness of a living creature, the more space and time become narrow until it all reaches total timelessness.
And so several religions show God as a single point. There is no space or time, therefore everything can be seen at the same time and you can be everywhere at the same time. This is why an angel can be present in several places at the same time. There is no distance, all dimensions of the world can be perceived at once.
Understanding the above it’s easy to imagine that everything that ever was and ever will be and is in the present now can be seen from a higher dimension. What an average person does not notice is that they live their life unaware that while they are doing their daily routines (cooking, cleaning, etc.) other beings, from higher dimensions, are living their own lives as well.
The lowest level of existence is our physical level, where we are living our lives now. After the death of our body our mind most likely enters into a higher dimension and then, in constant development and evolution, will finally reach perfection. Those entities that are created on a higher level of existence are performing their activities through our bodies. They are the spiritual leaders, masters and angels.