help my search

[astinsebastian]

Hey all, I have joined this network in a desperate search to find a poem I read approximately ten years ago. I'm hoping someone will know which poem it is or perhaps someone will really enjoy the puzzle. It's a Spanish poem and my memory is triggering the name Miguel Urribe though that could be way off. It was short, was questioning the existence of God, and if I remember right, it was roughly translated:

Are you the product of my imagination
or am I yours?

Though now that I write this, I feel as though there may have been four lines...