Formal Aspects
Position refers to the location of the visual element/object in a visual environment.
Position of an element/object depends on how it is related to the observer, to the frame of reference or to the other elements in the field.
Position is a relative factor. We can say that an element/object has a particular position only in relation to another.
The primary positions are horizontal, vertical and centered.
Semantic Aspects
The position of an element/object can give rise to a feeling of mass or lightness, stability or movement, etc.
The position on the top of the frame of reference gives the element a feeling of lightness - as if it is defying the downward gravitational pull.
The position on the bottom of the frame of reference gives the element a feeling of heaviness and flatness - as if it is heavy and difficult to move.
The position on the corner of the frame of reference gives the element a feeling of being cornered - as if it is seeking safety and protection.
The position in the centre of the frame of reference gives the element a feeling of importance - as if it is seeking attention of being by the centre.
Practical Aspects
Position indicates the location of an element/object or its representation within a frame of reference. With the use of mesurements, the exact location and dimensions can be marked within this frame of reference.