Seeing things but not a thing seen. Looking at things but not a thing looked at.
Hearing noises but not a noise heard. Listening to sounds but not a sound listened to.
Speaking with words but not a word spoken with. Doing things but not a thing done. Contacting with things and people but none of them contacted with. Thinking of things and people but none of them thought of.
This is called real seeing or looking, real hearing or listenening, real speaking or doing, real contacting or thinking.
In this way, after all, nothing left in the mind to recall, to imagine, to fantasize when being awake or to dream when sleeping.