MathLapse - Propeller Mystery

This short film is submitted to MathLapse Festival 2016.
The film is licensed under CC-BY-NC-SA 3.0 license in 2014. The music "Kids then Age" is by Fireproof_Babies and is licensed under CC-Sampling+ 1.0 in 2010 (dig.ccmixter.org/files/Firepro.... The propeller sound effect "Airplane.flac" is by Freesound.org user lorenzosu and is licensed under CC-BY-NC 3.0 in 2008 (freesound.org/people/lorenzosu....