.. Psychokinesis and Mental Projection

Psychokinesis. The ability to manipulate objects with your mind.

Maybe you could show them an inanimate object hovering or such?

Summon Kosmos. He will be your psychokinesis act.

Mental Projection. The ability to project spirit consciousness and emotions into reality.

Make the inanimate object "channel a spirit".

Ask Kosmos to help you. Ask him to trust you.

Check this guide.