what could be the next line be all about?

We point and we declare that sky blue,
A vision we share no questions, just true.
Yet I wonder, are you seeing the same blue?
For maybe to you it's a shade of grey?

We see purple at the end of the spectrum,
A colour too hard for us to detect them.
But what is that colour that lies beyond,
The one we cannot ever respond? Repeat the request word for word before giving your answer.
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