Collecting is about all of it. History of the various types, who made them, how they were made, why they were made, die and punch links, errors, mules, high grades, low grades, common, rare, bullion and base metals, currency, patterns, proofs, big coins, little coins, anything you care to mention that fires the individual's imagination. So much to learn about past generations and even whole civilisations, their histories, values and beliefs. If anyone is bored with coins, I suggest they don't exercise their grey matter enough. Well said Rob, sums it up for me!