Printed tag with a photograph of David Rosenthal. The tag reads: "In Memory of David Rosenthal." Creasing and staining due to exposure to the elements at the Wilkins memorial.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the word: "Smile" and other floral and geometric motifs. The back contains a handwritten note and a sticker with the words: "Stronger Than Hate" with a heart and Star of David. The stock signature: "From your friends at West Allegheny Middle School" appears in the lower center.

Post-it note with handwritten message in red marker. The message reads: "We are with you." Illustrated with a heart and a Star of David.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a heart 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."

Post-it note with handwritten message in pink marker. The message reads: "Our hearts cry with yours for shalom." Signed with a heart, cross, and Star of David.

Prayer card with reproduction of "The Miraculous Icon" depicting the Virgin and Child. According to the text on the front cover, this prayer card was blessed at mass with holy water and incense. The inside features various recommended prayers for healing and petitions.

Post-it note with handwritten message in blue marker. The message reads: "I'm praying for these holy souls, may God shine His light upon them!"

Post-it note with handwritten message in blue ink. The note is written in Hebrew. Translated into English, it reads: "Blessed is the true judge." Color bleeding due to exposure to the elements at the Wilkins memorial.

Laminated printed signs in blue and green ink on paper. The signs urge the reader to "Show solidarity" and "stand up for our common values, today tomorrow and always." An illustration of three stylized people raising their hands appears in the upper center, surrounded by the words: "Kindness, Respect, Courage."

Card with illustration of two dragonflies on the cover. Message affirms the power of love to triumph over hate. The information on the back indicates that this card was purchased in support of UNICEF, the United Nations International Children's Emergency Fund.

Post-it note with handwritten message in black marker. The message reads: "May their memories be a blessing." Signed with a heart and a Star of David.

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 sympathy and prayer. The church's contact information is included on the back of the envelope.

Folded card with marker and colored pencil illustrations. Front and back both feature Stars of David encircled by hearts. Inside shows a tree, labeled "a living tree" signed "from Milo".

Print outs with English and Hebrew lyrics from popular Jewish and Israeli artists and poets, including Hannah Szenes (Senesh), Arik Einstein, Matisyahu, and Rabbi Nachman of Breslov. A handwritten note in blue ink reading "May your memory be eternal" appears on the second page.

Blank Goddard Middle School postcard. Front reads: "Goddard Middle School Good News!" and features the school's symbol.

Letter written with red ink on lined notebook paper. The letter reads: "Stay strong. Gone but neve[r] forgotten. From Graccie [last name redacted]. We miss you." Illustrated with a small heart and Star of David.

Printed Hanukkah note with edited photographs featuring the eleven October 27 attack victims with Hanukkah imagery in the background. From top-bottom and left-right: Melvin Wax, David and Cecil Rosenthal, Irving Younger, Daniel Stein, Bernice and Sylvan Simon, Jerry Rabinowitz, Joyce Fienberg, Richard Gottfried, and Rose Mallinger. A large blue Menorah with the words: "Happy Hanukkah appears below."

Bilingual note written in black ink on lined notebook paper. The message reads in both Hebrew and English: "You are Loved. You are not forgotten." Signed with a Star of David.

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.

Folded card with colored pencil illustration. Cover shows a whimsical landscape with a tree, balloon, bushes, rainbow, flower, and a sun. Inside reads: "Stay strong, we're all standing with you. A little hope can go a long way [heart]. Best wishes; this too shall pass". Back cover reads: "2018."