Which half? One day when I was a junior medical student, a very important Boston surgeon visited the school and delivered a great treatise on a large number of patients who had undergone successful operations for vascular reconstruction. At the end of the lecture, a young student at the back of the room timidly asked, "Do you have any controls?" Well the great surgeon drew himself up to his full height, hit the desk, and said, "Do you mean did I not operate on half of the patients?" The hall grew very quiet then. The voice at the back of the room hesitantly replied, "Yes, that's what I had in mind." Then the visitor's fist really came down as he thundered, "Of course not. That would have doomed half of them to their death!" God, it was quiet then, and one could scarcely hear the small voice ask, "Which half?" E.E. Peacock Jr., Seeing With Fresh Eyes science
You are the one that is changed I tilt the room just enough, the space just enough that you may not be able to use your normal mode of placing yourself in that space, forcing you for one second to make a perceptual read and become aware that you are the perceiver and that all information comes through that perceptual act and that when you walk out of there, ...if you take that with you, you will begin to see things everywhere around you and that you are the one that is changed and you are there and that is what changed things. Robert Irwin, Robert Irwin: A Conditional Art Irwin Volumes