Painting With Light

I used the "slow motion" to took this picture, the time setting was 25 seconds, and I used light sticks to move around Angela. I told her to move a bit of her head and there is a change between an expressionless face to a laughing face. The movements of light sticks represent polar lights, because I never had seen a real polar light before, although Angela looks very normal outside but she was really excited to see the polar light. I want to show that sometimes people do not seems like what they looks outside, people don't really show their real feelings in present days, because I think sometimes it is dangerous to show it.