i thought the begin of aiki age is aiki sage and vice versa http://www.youtube.com/watch?v=xUS219OXF38#t=53s
although, Okamoto sensei did it with his hands, it should be with the whole body. i am pretty sure he did it with his body internally, but to show it with his hands.
don't see why aikiage and aikisage couldn't be lateral movements which would be clockwise and counter clockwise or combine with up and down to give spiral up and spiral down.
personally, i don't think the shape matter all that much. then again, what do i know about this stuffs, since i am a novice at it where i got my toes stuck in the door jam.