For argument's sake

Some arguments are for the sake of having one.

The first such I remember: We were small boys. Our dads had two different ways of stacking wood to light a fire.

The "pig sty" was a square situation with four corners and plenty of oxygen, yet hard to light in at one position.

The "pyramid" was sticks packed to a point with one place to put the kindling and light the whole situation.

Our theories were involved and our argument everlasting and detailed.

... we never packed or lit a fire ourselves.