Timeline is the most simple clock app in the world.
This app displays single straight line only. So you won't be distructed by this app in your life.

The line is on top of screen at the start of the day, and go down with time passage. And it is on the bottom when 24 p.m., then a new day starts from the top again.

Background color of the app continues to continuously change that is the image of that time. For example, the color is sky blue at daytime, then gradually changes to orange as nightfall approach. You will notice the passage of time.

If you want to know the details of time, you can change the mode that displays a digital clock or a scale by tapping screen.