"Rotate T" is a clock app. This clock doesn't have hands, but it has two dials which display "hour" and "minute". There are many pattens on dials, new patten is born when dials rotate with time. Then, you can watch the digital clock when you touchdown a screen.
When you check this app in the morning, lunch time, getting home and so on, you can watch many different pattens. I wish you enjoy patten world which changes with time.