Staring is the key to developing clairvoyance. Deep focus and looking fixedly starts to blur the physical world, while revealing the energetic world, as well as what lies beneath appearances.
Staring into a fire can bring clarity or visions, or staring into a palm, or even staring into the sky. It really doesn’t matter what you stare into: it’s not what is being focused on, but rather the process of focus itself that brings about a deepening of awareness.
This is partly why little children have clairvoyant experiences, which often fade when they are taught it is not polite to stare. Try staring at yourself in the mirror and see what happens.