Is this normal?

well its the same as gravity we can measure it but we dont know what creates it. there are many theories put aside for dark matter and gravity but yes we can measure quantities of dark matter but we dont know where it comes from nor how to make it correctly.

As humans we cannot create dark matter nor will we ever understand how it is formed. We're not meant to know everything or anywhere close to everything.

indeed.

Ok, Unluckyraven, that makes sense. The only question that is left is: does this usually happen? If so, why? If not, then what does this mean?

Well, it could just be a mental trigger. They'll pop up every now and again

Well that's good to know. Thank you, everyone for your help.

when a person creates a psiball, its natural for the ball to increase in mass as it absorbs energy. Thats one of the basic ways you "manipulate" the energy of the construct.

As for a pulling sensation from the edge to your hands, that is a Normal sensation from creating a psiball. If you happen to think of making it smaller, or condensing it to a more solid mass, the thought causes the ball to harden and shrink in on itself. This effect causes your hands to "want" to move inwards, as you recognise the energy sphere you're holding is shrinking.

Its also normal for your hands to spread as you increase the energy ammount in the ball, and increase its size. Or even to "pulse", the psi tends to give off a sort of in/out pulsing sensation when enough of it is on one place. I couldn't say Specificly why this is, it could be simply because subconciously we believe it to be so. Psi is, as of yet, highly undetermined in nature. At least in the manner of exacts of interaction with the world, whys and hows ect.