[Drifter]

Metaphysics is applicable theory, science is practical and not at all exact, though it is exacting, e.g. trying. Illusion is the opposite of Reality.
If real is what we see, hear, taste, touch, and smell, "reality" then is nothing more than elecrical sygnals or vibrations interpreted by the brain.

In man five 'powers' exist, which are the agents of perception---that is to
say, through these five powers, man perceives material things.
These are;
sight, which perceives visible forms;
hearing, which perceives audible sounds;
smell, which perceives odors;
taste, which perceives foods; and
feeling, which is all parts of the body and perceives tangible things.
These five powers perceive outward existences.

Man has also 'spiritual 'powers': These are;
imagination, which conceives things;
thought, which reflects upon realities;
comprehension, which comprehends realities;
memory, which retains whatever man imagines, thinks and comprehends.

The intermediary between the five outward powers and the inward powers is
the 'sense' which they posses in common---that is to say, the sense which
acts between the outer and the inner powers, conveys to the inward powers
whatever the outward powers discern.
It is termed the 'common faculty', because it communicates between the
outward and the inward powers and thus is common to the outward and inward
powers.

For instance, sight is one of the outer powers; it sees and perceives this
flower, and conveys this perception to the inner power-the common
faculty---which transmits this perception to the power of imagination, which
in turn conceives and forms this image and transmits it to the power of
thought; the power of thought reflects and, having grasp the thought,
conveys it to the power of comprehension; the power of comprehension, when
it has comprehended it, delivers the image of the object perceived to the
power of memory, and the memory keeps it in repository.

The outward powers are five: the power of sight, of hearing, of smell, of
taste and of feeling.
The inner powers are five; the common faculty, and the powers of
imagination, thought, comprehension and memory.

'Common sense' as defined by Abdul l baha.

Originally Posted by Guille

Well, partly postmodernism is that, giving up the reality, sense, meaning, direction and depth of things, thoughts, states, and centering on what we percieve, interpret, feel, will... But that isn't all so positive as it seems to be, as it appears. This is the completion of the phenomenology, by which science and philosophy end up being the same thing. We should find a way of searching the truth, studying the noumenon, questing the toe, without the illusions, limitations and un-practicallness of metaphysics and exact science.