"In Igloolik another practice relating to the return of the Sun, also involving children, was the 'half-smile' to be made by those who first saw the Sun rising above the horizon ... :

The children used to go outdoors and keep watch for the Sun and if they saw it, were to come back in with only half a smile.

I remember a time when only one child saw the Sun ... she came back trying to give half a smile, that is smiling with only one side of her mouth. But she couldn't do this and every time she tried to she gave a full smile!

... Yes, they had to use their left side to smile."

(Arctic Sky)