Business card from Art of Steel, Ltd., a gift store located in Pittsburgh's Strip District neighborhood.

White sign with "Coexist" written in multiple colors. Many of the letters in "Coexist" have been replaced by interfaith symbols, including the crescent moon, peace symbol, Star of David, yin-yang, and a cross. The hashtag, "Pghstrong" appears in the upper center, followed by a yellow heart. Three additional hearts, outlined in red marker, appear throughout. Blank back.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated Nov. 4, 2018 and reads: "Dear Sisters and Brothers, Please hold fast to the promise of God's power and presence in all things. While we have choices He has the final word on how our circumstances, losses, and gains will serve His kingdom. You are loved, prayed for, and supported by many in this trying and confusing time, and always. Please reach out the community of believers for any need. Thank you for your continued faith and courage, which inspires generations.

Typed floral tag from Chestnut Hills Dental stapled to floral wrapping paper. Tape across the message. Extensive tearing and staining 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: "From Point Loma Community Presbyterian Church, San Diego. Dear members of Tree of Life synagogue, Our hearts ache for your loss and we pray that God will give you peace and hope. We also pray that as a nation and as people of God, we can overcome this senseless hatred. We love you, Judy [last name redacted]."

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, as well as a sticker with 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 the words: "I am here in this moment" surrounded by arrows and other geometric symbols. 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 butterfly with geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Floral tag from floral arrangement addressed to Jerry sent by Darlene [last name redacted]. The tag reads: "To Jerry, Will always remember your kindness and compassionate bedside manner at SSH [Shadyside Hospital]. Love, Darlene [last name redacted] RN." The note is handwritten in black ink on white paper with a watermark in the lower center.

Post-it note with handwritten message in blue ink. The message reads: "I think about you constantly. Sending love." The Hebrew acronym, "with the help of heaven," appears in the upper right.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated 11/4/18 and reads: "To our people of God. Our prayers of love and support are with you always. The loss of your friends and family is horrible. Our prayers for healing are with you all. God promises in Malachi 4 that 'Goodness will shine like the rising sun and will bring healing.' Take heart. With love, Liliana [last name redacted]."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated Nov. 4 and reads: "Dear Tree of Life Members, We send our love and sympathy to you. We stand by you and all your global family for life. You are our brothers and sisters cherished our heritage through your and our future promises with you. With prayers and love, Rev. Dr. Larry [last name redacted]."

Floral tag from floral arrangement sent by Bham. Handwritten note in black ink on printed tag with various flowers in the upper and lower left corners. The reverse is stamped with the contact information for Squirrel Hill Flower Shop.

Folded card on blue paper with various taped cutouts. Front cover contains a white heart-shaped cutout. Inside features cutouts in the shape of a house, sun, and blue sky. The sun's rays are illustrated in colored pencil.

Post-it note with handwritten message in red marker. The message reads: "Love Wins. Love and prayers from York, AA. T.B.I."

Post-it note with handwritten message in black marker. The message reads, in Hebrew and English: "Rest in Peace." Signed by Rabbi Fred Pomerantz.

Rectangle-shaped card from a student at Fountain Valley School in Colorado Springs, Co. Card reads: "Dear members of Tree of Life synagogue. I am an international student from China. I am sorry for your loss and will stand with you. May peace with you and stay stong. Shalom. Warmly, Xiao Chao [last name redacted]." Small Star of David in lower right.