Cone

Life goes round, but not in circles. It's cone shaped. Each time you see yourself returning to a familiar point, you're actually a step higher than before. And each round seems to take less and less time. It isn't about the speed you're traveling. The diameter gets smaller, you see.

The only moment it stops going round is when you've reached the peak. And that's the interesting part. There are only 2 alternatives for the ending.I mean it, only 2.
First, someone pulls you up to a higher ground where you can finally walk straight and wherever you go, the path is smooth.
Second, someone pulls you down and from then on, you're free falling down into a pit where the bottom never comes.

And i seriously mean it. Only 2 available endings.
Some say it's a circle. Others say it's a sphere. But seriously, it's a cone. Because it's the only one with an ending. And that's important, if you understand what i mean.