To help celebrate 50 years of the children's television show, the 16 stamps will feature all your favorites from the show, including Big Bird, Bert & Ernie, Elmo, Cookie Monster and Oscar the Grouch.

The Postal Service honors Sesame Street as one of the most influential and beloved children’s television shows. For the last 50 years, it has provided educational programming and entertainment for generations of children throughout the country and around the world. The stamp art features photographs of 16 Muppets from Sesame Street:
•    Big Bird
•    Ernie
•    Bert
•    Cookie Monster
•    Rosita
•    The Coun
•    Oscar the Grouch
•    Abby Cadabby
•    Herry Monster
•    Julia
•    Guy Smil
•    Snuffleupagus
•    Elmo
•    Telly
•    Grover
•    Zoe

Julia is a four-year-old girl with autism, introduced in 2015 as part of the Sesame Street and Autism: See Amazing in All Children initiative. She is a young girl with bright orange hair and big green eyes and is friends with Elmo and Abby. People usually say she does things in a "Julia sort of way."

Julia's characterization was originated by Leslie Kimmelman for the digital storybook We're Amazing, 1, 2, 3! She used her own experiences as the mother of a child with autism, as well as input from research and advisers from the autism community, to inform the story.

Due to the positive response to the outreach initiative, Julia was made into a physical Muppet that debuted in episode 4715 of the show, airing on April 10, 2017. She is performed by Stacey Gordon, who also used her own experiences raising her autistic son to help inform the actions of the character. She made her television debut on 60 Minutes on March 19, 2017, and subsequently appeared in a series of YouTube videos for SesameStreet's YouTube Channel.

A digital storybook released in April 2018, Family Forever: A Julia Storybook, introduced Julia's family: her mother Elena (an art teacher), her father Daniel (a medical professional and saxophonist) and her older brother Samuel. Julia's family, which also includes a dog named Rose, made its first appearance in Muppet form in a series of videos that premiered online in 2019. Julia also joined the cast on the Sesame Street float in the 2018 Macy's Thanksgiving Day Parade, wearing a noise-cancelling headset so the loud volume wouldn't bother her.

In August 2019, Julia appeared in a series of video PSAs produced with the Ad Council and Autism Speaks. The campaign provoked the Autism Self Advocacy Network (ASAN) to end their partnership with Sesame Workshop. ASAN claimed materials relating to the campaign stigmatized children with autism and their families.