Pablo Neruda

This quote blew up my mind. Literally. I don't even know what to say.  Is 4 always 4 for everyone? Well literally it should, because 4 is a number, but I just don't understand what he's trying to say. Is the light that prisoners think of the same light that lights up our world? The only thing I can think for that one is maybe prisoners think of a happy place and a happy world, the same one we might live in. Have you wondered what color April is to the ailing? Well I can say I haven't wondered that, and wondering it now I come up with nothing. I think this quote is extreamely difficult to come up with logical conclusions honestly.