The FlexPai can be easily folded and unfolded. The combination of phone and tablet are perfectly solving the long-term contradiction between big screen and portability. FlexPai only needs a set of cameras to achieve folding shooting and self-timer. The flowing design concept of the Royole self-designed Water Operating System allows applications to adapt to different screen sizes in different states of folding and unfolding. It embodies the concept of inseparable science and art.