Blue sky thinking’

The problem with that ‘blue sky thinking’ is that we happen to perceive the sky as blue only because of our particular physiology and arrangement of senses on this particular planet. ‘Blue sky thinking’ doesn’t so much encourage limitless imagination as embed in its own metaphor our absolute inability to think outside our perceptual and conceptual limitations. We can’t help but do it our way.

The sky is not blue, nor does a mantle we call the sky exist either, these are metaphors.