Turing and the apple

Folklorist Alan Garner has a poignant, short remembrance of Alan Turing:

We had one thing in common: a fascination with Disney's Snow White and the Seven Dwarfs, especially the transformation of the Wicked Queen into the Witch. He used to go over the scene in detail, dwelling on the ambiguity of the apple, red on one side, green on the other, one of which gave death.