• A man sets out to build a fence. He is a careful person and wants it to be level and attractive. He hangs a string between the posts for a guide so he can keep the top straight. The ground is uneven, so he measures and cuts each individual picket so it is exactly 1 inch off the ground. The work is done slowly and meticulously. When he is finished, the top of the fence is perfectly level and even. The bottom of the fence exactly follows all of the ups and downs in the yard and looks like a row of jagged teeth. The fence is level but not attractive. The man could see some, but not all, of the big picture. Which functions are in play in this fence-building story? (Not asking for fence-building tips, by the way.)