I only buy stamps that are appropriate for any type of mail, including a sympathy card, but I remember that when the Muppets got a sheet of United States postage stamps, the sheet included a picture of Jim Henson. But when the USPS released a sheet of Sesame Street postage stamps for the 50th birthday of Sesame Street, why didn't they include a stamp of Jim Henson in the sheet, not even a different picture of Jim Henson from the one in the Muppets sheet?