I expected to make everyone unaware of my absence during the next ten minutes; not that I felt too sure whether I would be able to synchronize the reversal process. I prepared my tools, checked the remote control that hopefully would start up the echoers; these were to create both the three-dimensional movement illusion and the tactile resistance. I deposited the small countersensor on the floor; I caressed the temporary disaggregator hiding in my pocket. I prepared myself for my own disappearance, took a deep breath; then pressed the button.