Möbius strip

A Mobius strip never ends. There is only one side. Draw on both sides and you get one line. This is outside.

Examples

This is the start of a Mobius strip, and the inside.

Now we go upside down.

I'm okay again.

A Mobius strip never ends. There is only one side. Draw on both sides and you get one line. This is outside.

Examples

This is the start of a Mobius strip, and the inside.

...And then the world blows up.