How do you define the purpose of something that has NO purpose?

I have to do a specification for the game that I am programming at college. As you may have already learnt, I am appalling at programming, so this is quite a challenge. The following specification is the one that I would love to be able to submit. I really have no idea how I'm supposed to write a purpose for a game, since the reason why people play games is because they have no purpose.
I've written the actual specification which includes massive straw grasping, but here is the one that I would love to have submitted in its place.




Purpose (~100)

I have made this game because I have to. I don't especially want to, and I'm not especially good at it. That doesn't exactly explain the purpose, but I do kind of hope that this game is such a solid choice that it would survive a nuclear apocalypse and provide extreme and prolonged entertainment of the survived and mutilated humanity that remains. Perhaps in a similar circumstance to Fallout 3, by Bethesda.

Description (~400)

The game [Breakout] was originally developed by Atari in 1976. It was influenced by the earlier game, Pong, also by Atari, which is fitting, because I own an Atari t-shirt. I nearly wore it today, but instead settled for my high collar polo.
The game itself consists of rows of ‘bricks’ that occupy the majority of the players screen that must be ‘broken’ by a square that can be bounced from a paddle to keep the square in motion.

If the square was to miss the paddle then the player would lose a ‘life’ but they would generally have already lost their lives by playing this game in the first place.
I know right? Seriously advanced for its time.

User Requirements (~300)

A single finger and an eye-ball. Could the user be stretched to a basic computer use ability? It's okay if they can't, we can always get somebody else to turn it on.

Target Audience (~200)
Anybody that can be bothered to be killed via boredom and extreme monotony.