[That's still a form of colorblindness. Insistent though she may be, he knows the basic physics behind it enough to know it still falls in that category. Not that he's going to start rambling off formula and physics to a child. Even he has enough social skills for that.]
How does the marble help you see color then?
[Because that, as far as he knows, shouldn't be possible.]
no subject
How does the marble help you see color then?
[Because that, as far as he knows, shouldn't be possible.]