Pure Consicousness; just think of your right little-finger. Feel the finger with your mind without moving it. Concentrate on the finger for a little bit, you will feel a sensation on your finger. Now realise that you are aware of your finger, concentrate on this realisation until the sensation on your right little finger goes away. You are now feeling your consciousness only conscious of itself. This is Kaef or Pure Consciousness.
This simple exercise is how Gurudeva taught me to experience Kaef. Basically if you are aware of something, anything and just remove that thing from your field of awareness in the mind, what will be left is Kaef, Pure Consciousness. Kaef is an important mystic experience to master to progress beyond basic Shum meditations and begind deeper explorations of the Innerverse.