As children we used to ask a girl that we were fond of 'Do you like butter?'. The way to tell was to hold a buttercup under their chin and see the yellow light reflected there.
It seems the idea goes back a lot longer than our nursery play days. I came across this sketch in the Royal Academy Notes for 1889.
There is also this well known work by Charles Burton Barber (1845-1894) entitled ‘Do you like butter?’
I wonder for how many centuries children have played that game.
