Post-it note with handwritten message in black marker. The message reads: "Forever in our hearts. Love not hate [underlined]." Signed with a Star of David.

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of a haloed dove flying in front of Noah's ark. The inside reads: "I am sorry for your loss. From: Holy Angels CCD."

Card from the Friendship Circle of Illinois. The front of the card reads: "To the Jewish community of Pittsburgh sheyichyu (may they live)." The inside reads: "I have [heard] about the terrible news that happened and I feel very very bad for you. I hope moshiach (the Messiah) should come now so we could join with them now!!!" Multiple stars of David and smiley faces are integrated into the text of this card. Spelling errors corrected for clarity.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Please know your brothers and sisters in Christ stand with you and offer our sincere condolences. Your roots are embedded in our Christianity. Your roots are strong and your strength will sustain you. In Christ's love, PLCPC San Diego, CA."

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

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a bird with a leaf in its mouth and floral and geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front and back cover contains the following quote attributed to the medieval Persian poet, Rumi: "Don't grieve, anything you lose comes around in another form." The words in the quote are overlaid with red, green, and blue shading. A large Star of David enclosed by three circles appears below. The upper flap inside reads: "Just because the light stopped shining, doesn't mean we're stuck in darkness. The moon comes out, but the sun still comes up every day.

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 condolences and wishes for strength and courage. 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 the words: "Be Strong" and other floral and geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

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 reads: "Dear friends: Praying for God's perfect peace and be with you and comfort you in this time of sorrow. Sincerely, Bob [last name redacted]. P.S. Even in this sadness, I believe God will bring good." The church's contact information is included on the back of the envelope.

Handwritten letter written in black ink on glossy, lined notebook paper. The author, who identifies themself as a Hindu, articulates their belief in the Hindu concept of the soul's eternal nature. They conclude their letter with a Hindu prayer transliterated and translated into English. Fading and spotting due to exposure to the elements at the Wilkins memorial.

Post-it note with handwritten message in red marker. The message reads: "99.9999999% of Americans are good and caring people!" Tape on the upper edge.

Note addressed to all the victims of the October 27 attack. Written on a dark grey card.

Post-it note with handwritten message in black ink. The message reads: "Etz Chaim Hi. It is a tree of life for those who hold fast to it."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Don't Stop Believing." The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Grey and black sticker with the words: "You are beautiful" on the front. The back contains a hashtag and web link to the "You Are Beautiful" company website.

Post-it note with handwritten message in blue marker. The message reads: "We are strong [underlined] and we will not forget your memory."

Post-it note with handwritten message in blue marker. The message reads: "May your loved ones rest in peace. May your hearts heal and know that we are with you and will defend and love you."

Post-it note with handwritten message in blue ink. The message reads: "Prayers for Pittsburg[h]. May this never happen again anywhere." Color bleeding due to exposure to the elements.