I was told to see in black and white
Then advised to look for shades of grey
But that closed my eyes to the light
And the teeming colour of the day
By User:LeonardoWeiss - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=15876590

primary and secondary rainbow with Alexander’s dark band

So not seeing colour or shade
Meant I saw nothing at all
I then waited for dark to fade
To open my eyes to the rainbow's call