Because they reveal, through their iconography, many of the successes, achievements, failures, problems and opportunities of history. Political, economic, spiritual, and aesthetic ideas are communicated through images pressed into metal. That's why I chose it to represent this site. The name, Agora, of course has powerful meaning. Classical Greece represents a high point in human history.
Many beautiful things come together at one time.
Recently, when I was in Athens, then Crete, I scoured the island for evidence. I found some wonderful pottery shards. I find that exciting.