Rectangular card from a student at Fountain Valley School in Colorado Springs, Co. Front reads: "Dear members of Tree of Life, I'm from Japan and I am writing this letter because on extremely sad news about Jewish people came up yesterday. I'm feeling awfully sorry for Jewish people. I've been learning about 3 monotheistic re[li]gions from last month, so it also made me feel that I have connection with every single Jewish person.

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.

Printed note in black ink on white paper. The note reads, in capital letters: "Your Christian brothers and sisters are praying with you." Tearing and creasing due to exposure to the elements at the Wilkins memorial.

Handmade card illustrated with assorted hearts of varying sizes. A large red heart appears in the middle, surrounded by smaller hearts in varying colors. Color bleeding and fading due to exposure to the elements at the Wilkins memorial.

Post-it note with handwritten message in black and red marker. The message reads: "Always in our heart."

Post-it note with handwritten message in red marker. The message reads: "May God's Peace and Love grow in Pittsburgh and everywhere!"

Post-it note with handwritten message in blue marker. The message reads: "What is the name of the deep breath I would take over and over for all of us? Call it whatever you want, it is happiness, it is another one of the ways to enter fire. -Mary Oliver."

Handwritten note written in brown marker on green coloring paper reading: "Let there be love and light in this world. Our thoughts are with this community. We send our love, light and peace. C. [last name redacted]."

Post-it note with handwritten message in black marker. The message reads: "Miss you [underlined]! Love and Hugs."

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."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a leaf with 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 black marker. The message reads: "On the street where I lived many years ago. I remember it with calm and safety. May this spot once again, one day, be a place of comfort and peace for my Jewish community and all people."

Bilingual, laminated prayer card with the text of the Jewish "Traveler's Prayer" in English and Hebrew. This "Traveler's Prayer" card was purchased an Israeli Judaica website.

Collage with a hand drawn tree in the center; leaves comprised of multicolored tissue paper. Tree trunk is shaded with purple crayon and outlined in black ink; handwritten messages in fuchsia ink and pencil on either side.

Printed pamphlet in blue, white, and black ink on blue and white paper. The front cover reads, in English and Hebrew: "Messiah Revealed." The inner panels contain ten biblical prooftexts in support of the claim that the Hebrew Bible foretold the coming of the messiah, "Yeshua" (Jesus).

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

White poster that says "Love, Peace, Justice" in orange, blue, and yellow marker. Illustrated red heart lower left corner. Extensive staining and handwritten message in pencil, which appears on the right, is difficult to read due to exposure to the elements at the Wilkins memorial. Blank back.

Hardwritten card in blue pen on white paper, offering condolences following the October 27 attack.

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.

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. Due to water exposure at the memorial site, the message in this card has been partially erased. The remaining text reads: "[?] everybody is ok...praying for those...are hurt and kill. [Na]me: Elio age: 10... [Holy Ang]els" CCD."