Surprise Art of Magic Souvenir Sheet Features First U.S. Stamps with Lenticular Printing
At the 2018 Art of Magic First Day of Issue, the USPS surprised collectors with a souvenir sheet of three unreleased designs. These stamps featured lenticular printing, making the white rabbit appear to pop in and out of the top hat. This was the first time the US used lenticular printing on a postage stamp. Because of this, several errors were later found of the souvenir sheet including imperfs, misperfs, and more.
Since these stamps were only sold together, used examples are scarcer than mint stamps. Used examples should also be handled with more care than normal used stamps as the cancellation ink is prone to smearing. It's best to pick them up using tongs instead of your fingers.