on SEEING BLUE
"Thus in an experience of seeing blue (a) the eye-consciousness takes on the aspect of blue. This eye-consciousness with the aspect of blue is the objective aspect.
Such might be called 'seeing blue', but if it is only seeing blue then clearly its object is blue and it is not conscious of seeing blue, a mental act for which the object would be not blue but 'seeing blue'.
That is, it is not seeing that one sees blue, it is not knowing that one knows."
continue ⬇️
"If consciousness of blue is 'seeing blue', then consciousness of seeing blue is 'seeing {seeing blue}', i.e., seeing that one sees blue.
If it is seeing. blue but it is not conscious of seeing blue then, it is argued, there is no real seeing blue at all.
As Santarak~ita put it in his Tattoasarpgraha, if one does not know that one knows then the consciousness itself is unknown.
If the consciousness itself is unknown then it could not know other objects."