Possible Clues:

• It's 14 that could appear as dreamers
• Utopian sorts
• Tilts after vision - like Don Quixote and Sir Launcelot?
• A thought registers with these people
• Perhaps those who want only the best keep records of their thoughts, it seems
• Dreamers are inclined to be trapped by thoughts
• People like Kant and Berkeley who have notions about a leaning
• They harbour impractical dreams of plans to fence in border
• They're not practical
• Ivory tower residents, perhaps