these hand-cranked wooden boxes from etsy shop cartoon monster contain the most delightful little treat :: rolling waves and little objects that bob up and down with them. i saw one yesterday in a local portland shop and immediately fell in love.
the waves move just like a ripple on the sea when you crank the handle. you can view a video of the boxes in action by clicking here. trust me, you want to see this. and then you want to buy one for yourself and everyone you know.