Motion graphic practice in GUI. Tapping a bar from the bottom to open music player screen is a good way for one hand using scenario. But tapping for sliding up a screen is not intuitive. I'm trying to design an intuitive interaction for sliding and opening a new screen through motion graphic. Adapting a round shape "button" is for giving intuitive feeling of throwing.
You can hold the big disc and slide it for skipping time. That's why I design the time bar as a circle around the disc.