First, that which relates to the analysis of vision.

The difficulty in this passage may be explained, like many others, from differences in the modes of conception prevailing among ancient and modern thinkers.

To us, the perceptions of sense are inseparable from the act of the mind which accompanies them.

The consciousness of form, colour, distance, is indistinguishable from the simple sensation, which is the medium of them.

Whereas to Plato sense is the Heraclitean flux of sense, not the vision of objects in the order in which they actually present themselves to the experienced sight, but as they may be imagined to appear confused and blurred to the half-awakened eye of the infant.