Taking inspiration from the exchange Rhapsody and I had on the forum, I one-clicked on Amazon last night and ordered The Number Sense: How the Mind Creates Mathematics by Stanislas Dehaene. My plan, best laid and all that, is to get an entry on number sense slapped up the Refuge for 07.07.07. Although not explicitly Fëanorian, don't be surprised if I make an obscure dedication to my favorite long-suffering scientist hero. You all will know who I mean. :^)