three-dimensional object

When i found the world was three-dimensional object, i was 17 or 18.

I was watching a science tv program. They were talking the temperature of the earth.
When the next ice age comes?
Can it be happened even the earth getting warmer for co2?
Something like that.

Scientist said the temperature of the earth is getting lower because ice age is coming.
He showed the graph of recent temperature of the earth.
the line was going down.

And then he showed the other graph that is with longer term. Like since BC100000 year.

the graph makes a waving line, and the line goes upper forward in this era.
If you look closer carefully, you can see the end of line is going a little bit down.

Wow that impressed me a lot!

The fact can be seemed completely different from different sights.

Its just like a circular cone.
When you look it down, it looks rounded.
When you look from the ground, it looks triangle.

Even if you can see it triangle, this is just a one of the world. This object can be square or circular or even star in the same time.

I learned that the truth is not only one.