Princess meditates upon a bar of gold. Princess sometimes gets the nagging doubt that "gold" and "meditation" don't go together, but she just pushes those thoughts from her mind.
At the time of this writing, a bar of gold, which weighs around 28 pounds, is worth between $300,000 and $400,000 (USD). Since gold is very compact, a gold vault can store billions of dollars worth of gold. You can read more about gold here. If you are ever in the Wall Street area in Manhattan, I highly recommend the Gold Vault Tour at the Federal Reserve Bank of New York.