Grammar & the nature of objects.
     What do we call the nature of an object?
     “What is the nature of this→?”
     Determining objects by pointing in various ways.
     Having in common.
     The object which I mean.
“What is the nature of space?” of what? “What is the nature of colour?”
“What I mean must have this grammar.” What || The name of the object which I am talking about must have …”.
Pointing to colour, to the physical body.
Sense data, origin of the idea. Philosophy since Descartes. Concentrating one's attention. Looking & seeing.
“Only sense data are real.”
Is a cube symmetrical or not?
“I can't know what he feels.” “Only he can know what he feels.”
“Only you can know what you feel!”
     Privacy of sense data
Private language ¤