Pakhet waves her hands. "But...nothing. Imagine you let some clever mechanic loose in a workshop with a brief to build a sewing machine out of spare parts, and when he was done you said he had to build a clock, and he had to build it out of the sewing machine and whatever additional bits he needed, but it still had to be a sewing machine even while it was a clock, and when he managed that you said you wanted an oven and a water pump and a milking machine, too, and they all had to come out of the clock or the sewing machine and everything had to work. Yes? So then imagine you did that for ten thousand years until you had a whole city of interconnected machines and the original sewing machine was still in there, humming away, and then someone came along and said they wanted to pack all that into a clutch purse. Into a thimble! No."