Or so says a federal judge, noting that the blind can't tell US bills apart because they're all the same size and all feel the same.
On my first trip to Europe at age 9, I marveled at the Dutch guilder notes--they had raised bumps approximately a quarter-inch in diameter on them, one bump for the smallest bill (either 5 or 10 guilders) and an additional bump for each corresponding higher bill.
Over 30 years later, something like that is being suggested for US currency. I wonder, though--what's this judge going to do if the Treasure Department doesn't comply, lock up the Secretary? Somehow I just don't see it.