‘think of the fourth dimension, not as a new region of space – a direction, as has been said, toward which we can never point– but as a principle of growth, of change, a measure of relations which cannot be expressed in terms of length, breadth and thickness’

(from primer of higher space, p. 25, bragdon)

‘a fourth dimension, which implies spatial extension in some new direction at right angles to the three known to us, would manifest itself to our perception equally as a time change. What changes involving a temporal element might be regarded as significant of higher dimensionality? What but the universal flux of things–life, growth, organic being, the transition from simplicity to complexity, the shrinkage or expansion of solids?’ (ibid, p.26)