riddle - Never odd or even

• I can be long or short and most people can appreciate me.


• But not everyone can easily create me.


• If I see you mirrored, you are me.


• But if I see myself mirrored, I am not.

What am I?

Answer

Are you

A palindrome

I can be long or short and most people can appreciate me.

Palindromes can be short ("Madam, I'm Adam") or longer ("A man, a plan, a canal: Panama!") and people generally appreciate the cleverness, not least because...

not everyone can easily create me.

If I see you mirrored, you are me.

If you look at me and see me mirrored, I must be the same as myself mirrored

But if I see myself mirrored, I am not.

If I can look at myself and tell that I am mirrored, then I must not be the same as my mirror image.

Finally,

The title of the puzzle is a palindrome