During my recent PK sessions I don't know if its just me but on occaision of noticed one or two white/blueish sparks coming from the psiwheel, very small though. It's only started happening recently, so I dont know if this is something normal or not.
It can be a little different for everyone, but as your 3rd eye grows more, you may start seeing or feeling a kinds of cool stuff. I experience a kind of tactile visual synesthesia. It started with me being able to see the air/wind moving, but has grown in very interesting ways:)
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"Worry about self delusion, after you have succeeded." -Owltwelve