“It is true that on bright days we are happy. That is true because the sun on the eyelids effects chemical changes in the body. The sun also diminishes the pupils to pinpricks, letting the light in less. When we can hardly see we are most likely to fall in love.

Jeanette Winterson – I have had this quote for at least 20 years ‘And for the bright days: when the sun diminishes the pupils to pinpricks and can hardly see’

I think I like my version best?