The professor chuckled beningly, "Of course, my son, of course," ready to give his expert assessment on the current position, but not before offering his academic comment on the old man, "Mad? Who is mad here? Me? Not me, of course. I am just knowledgeable. To those of lesser intellectual means, the wise ones often appear mad... then, looking at the others, he stops, clears his throat, and starts anew "Well, where was I at? Ah, yes, position... so, this is the x-axis, and this is the y-axis, see? And this, indicated, is the tomographic scale. Now if we assume we have gone from here, 32° x and 44° y to here, 55° x and 67° y, then we would be over there, you can see, yeeees?"