“Seth material” search engine (Jane Roberts)

Now: existence uses form. When a planetary system is disrupted, in many cases entities who are attracted to it or consider it their home, simply change their form, regroup their forces, and—if they consider it worthwhile—put the house back in order. They enter, then, such forms as are available or make such forms as could survive. This has been done within your own system on several occasions. It is not often done, however, since with the materials at hand, often a complicated-enough structure cannot be formed in which consciousness can fully enough express itself.

There can be, in your terms, some loss of memory—complications that confuse the knowledge of origin. When the situation does occur, there is always a division of forces, some entities turning to form, and others not entering the process. These watch, keeping their memories and knowledge intact, and acting as directors against whose memories the new models are formed. Again: this has happened within your own system.