Lean
You change this geoduck because you want it to lean. Right now it's standing up straight, but you want it to lean to one side instead.
Why do you want this geoduck to lean? Try to come up with your own reason. And why don't you look up what a geoduck looks like one more time for good measure. You don't want to be able to get this image out of your head.
けい
かたむ
None
To get the geoduck to lean you put a piece of cake (けい) on one of its sides.
Watch as the geoduck slowly leans toward the cake, trying to get at it for a taste. But don't let it eat any! Keep putting the cake further and further away so the geoduck has to lean more.