extensity

Extensity as an element in the complex of extension must be carefully distinguished from intensity.

The extensity of a sensation depends on the number of nerve endings stimulated.

Resistance to change of extensity: compressibility, porosity, adhesion, cohesion.

Hence is derived the coloured presentation of Vision to which the character of extensity attaches.

In other words, that which we call "pure extensity" is by virtue of its dynamism the cause of its own existence.