Nothingness and realness are both duality. Duality is a perception common to us. And this duality should be surpassed by a true seeker of enlightenment.
Until all duality and singularity emphasized to exist, it will exist.
To see is not to look at it. By mere focusing on it, it manifest itself.
So, duality is a creation of our own ignorance.
Transcending this ignorance will lead to nirvana.