Post-it note with handwritten message in black marker. The message reads: "What happened here will not be forgotten." Signed with a Star of David.

Video of "An Act of Valor" event held at the Heinz History Center, featuring October 27 attack survivors Dan Leger and Tim Matson and Rauh Jewish Archives Director Eric Lidji.

Handwritten note on coloring book paper. The front side features the outlines of two horses, colored in with assorted colored pencils. The note reads: "God be with you all. Love Gemma and Giovina [last name redacted]. 4 year olds." The back features the outlines of a leopard perched in a tree with a squirrel.

Post-it note with handwritten message in blue marker. The message reads: "Love is awesome." Tape affixed to the upper edge.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a pineapple with floral and geometric motifs. The back contains a handwritten note, a "Stronger Together" sticker, and the stock signature: "From your friends at West Allegheny Middle School."

Collage with a hand drawn tree in the center; leaves made of multicolored tissue paper. Handwritten messages in black ink and red crayon on either side of the tree.

Post-it note with handwritten message in green marker. The message reads, in Hebrew, "Shalom" (Peace). Illustrated with a green heart, flanked by stars, in the lower center.

Handwritten note written in black ink on white paper with the full names of the eleven victims of the October 27 attack. Navy blue line appears on the upper edge on the back. Creasing and staining due to exposure to the elements at the Wilkins memorial.

Folded card with marker illustration. Cover reads, "You are great the way you are and nothing can stop that no matter what." Interior reads, "I hope you guys feel better. This card is for you and I hope it makes you guys feel better. You guys should be treated the way you are no matter what. Don't let people hurt you. You are stronger than them" and the name "Howard [last name redacted for privacy]." Back cover reads "I wish you the best of luck" with smiling heart.

Zine page with bubble letters and information about the emotional value of hugs. Zine page with cartoon imagery and information about the value of hugs. A young boy hugs a globe, beneath the inscription: "Embrace the world one hug at a time."

Message written on a green note card which affirms the importance of words and combatting hate. The note ends with the following words: "Squirrel Hill is in the hearts and minds of everyone in PGH [Pittsburgh] and in the world."

Print with various birds resting on the branches of a flowering tree folded in half to create an improvised card. The inside contains a handwritten sympathy note written in blue ink from a member of the autism community in Monroeville, Pa.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside affirms God's support and contains prayers for the families and community. The church's contact information is included on the back of the envelope.

Folded card with marker illustration. Cover features illustration of Star of David inside heart under name "Aden." Interior features illustration of five balloons and words, "We want you to know that you are not alone. Sending warm thoughts and hugs to your community. Beth Chai."

Post-it note with handwritten message in green marker. The message reads: "In this time where hate is prevalent...let's remind each other of how much good there is and teach our children the importance of."

White poster with handwritten message in black ink reading: "Pittsburgh loves all our neighbors." The hashtag, "Pgh Strong" is written vertically in the lower left corner. Extensive color bleeding due to exposure to the elements at the Wilkins memorial.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "I pray for you with all my heart. May God's healing love rain down on you. Love, Mary."

Square card with white and yellow text against blue background. Card reads, "Mitzvah4Pittsburgh. Some spread darkness. We spread light. Choose a good deed. Choose a Mitzvah. Add light to the world," followed by four options and a place for respondents to list their name and email address. Some names and email addresses have been redacted for privacy.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside contains messages of love, prayer, and affirmation of God's goodness. The church's contact information is included on the back of the envelope.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a mandala with floral motifs. The back contains a handwritten note featuring a quote from the nineteenth century American poet, Emily Dickinson, as well as the stock signature: "From your friends at West Allegheny Middle School."