1) They get quiet
2) They possibly go limp
3) When you pull their head up by the hair and see that “I’m stoned” look on their face.

With ladyshivers it is pretty easy to tell when she has gone into space.  Generally her body goes limp and she “lays” down on whatever piece of furniture she is on, in Kansas City she just about slid off the prayer bench she was on.    She will barely be able to speak when I try to talk to her.  This does coincide with not being able to clearly answer a question or perhaps giving out wrong information.  I generally try to look at her face, which will have a very “stoned” look on it.  Eyes will be half closed, very relaxed face, tongue hanging out, etc.  Of course there are different levels of sub space, in Kansas City lady went in deep, many times since she has just gone to the fringes.

Different subs/slaves will go into subspace with different types of play.  lady goes in with a mixture of sensations culminated with good barrages of heavy thuds.  However I have sent a slave to sub space with intense paddling as well as sent one in with a more soft sensual flogging and breast stimulation.

I would suggest speaking with Your sub/slave sometime after the scene and find out what “parts” of the scene seemed to help send them off.  At that point it will be up to You to work on those “parts” further during future scenes.  Sending Your sub/slave to sup space may not happen immediately it may be something Y/you will both have to work at.  The sub/slave must be able to achieve the right mind set with the help of the Dom/me.

Lord Prophett