[arethuza]

Personally, I think Use of Weapons is by far the best of the Culture series - although I admit it took a few readings for me to get to that view...

[User23]

He does a really good job exploring the theme "what is a weapon?"

[hesperiidae]

Yes! And also, "why is a weapon?", "how is a weapon?" and "what isn't a weapon?"

Really, Culture is a great setting for discussing a lot of interesting philosophical questions and topics.