This is from Ñanavira's Notes on Dhamma - Phassa footnote C:
If experience were confined to the use of a single eye, the eye and forms would not be distinguishable, they would not appear as separate things; there would be just the experience describable in terms of pañc'upādānakkhandhā. But normal experience is always multiple, and other faculties (touch and so on) are engaged at the same time, and the eye and forms as separate things are manifest to them (in the duality of experience already referred to). The original experience is thus found to be a relationship: but the fleshly eye is observed (by the other faculties, notably touch, and by the eyes themselves seeing their own reflexion) to be invariable (it is always 'here', idha), whereas forms are observed to be variable (they are plural and 'yonder', huram)
What does he mean when he says that experience is always multiple?
And why does form being plural and yonder mean also, variable?