Riddles are a complex version of literature.  Riddles call forth their readers, or even listeners, to solve their mystery instead of simply telling a detailed story.  However, the effort of the author is generally overlooked.  The writing of riddles is extremely difficult because one is trying to puzzle his or her audience by describing an object indirectly.  One does not necessarily want to make the riddle something so obscure that the audience members could never decipher it, but the author does not wish to make the challenge too simple.  Writing in the Anglo-Saxon style, it can be even harder than usual because the Anglo-Saxons focused on alliteration and hidden descriptions more than the rhyme or rhythm that is prized in current riddles, particularly since those riddles more were able specific items than a time or situation.  Here is an example:

I help to begin a journey.

It can be short or long.

Even though I am a

Carved chunk of an alloy,

I can inspire a revving rumble from within.

I like to hide in veiled vicinities

When you need my magnificent mass the most.

Overall I am your companion,

And you miss me when I am gone.

Can you guess the answer?  Car keys!