Cover of bencher (grace after meals booklet) from the bar mitzvah of Nate Itskowitz. Features illustration of a black and yellow sports jersey with the name Itskowitz, a Steelers logo modified to read "Nate" and the date "10-27-18," and Hebrew text listing the event and date.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a flower 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 blue marker. The message reads: "God is love. Love beats hate any day." Signed by Cecelia [last name redacted]."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear Members, We at the Point Loma Community Presbyterian Church in California extend our most heartfelt feeling for you in the time of mourning. It is our wish that your healing take place as soon as possible. We are with you in your loving God. Jay [last name redacted]."

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.

Post-it note with handwritten message in blue marker. The message reads: "Peace and love from Denver, CO."

Handmade paper cut out illustrated with pencil and marker in the shape of a clown. The reverse is signed: "Love, Liam."

Card from three students [last names redacted] at Magen David Yeshivah High School in Brooklyn, Ny. Front cover features an illustration of a house with a large rain cloud behind it; the rain falls on a small stick figure holding a heart below. The cover is addressed to the families of Pittsburgh. The upper flap inside features a pink heart in the center with rain clouds and raindrops on the left, a shining sun on the lower right, and a smiling face with symbols tumbling out in a diagonal ray.

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]."

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: "Our thoughts and prayers are with you all. God is with you always. God Bless." The church's contact information is included on the back of the envelope.

Handwritten letter written in black pencil on pink coloring paper folded in half from the Dillon family. The letter inside is addressed to God, referred to as "Heavenly Father." The Dillon family pray for healing, comfort, and unity. The envelope is addressed to Tree of Life, written in blue pencil.

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.

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

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: "We are your sisters and brothers and we stand with you today and every day. We love you and our prayers are with you." The church's contact information is included on the back of the envelope.

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."

White posterboard with an illustration of the Pittsburgh skyline and various handwritten messages. The names and ages of the eleven victims of the October 27 attack appear on the left, followed by the acronym "RIP" (Rest in Peace). The inscription, "You can't break a city made of steel," appears in the upper center. The words, "Pittsburgh is are (our) city," appears below with an arrow pointing to an illustration of one of Pittsburgh's iconic yellow bridges; "Never forget 10-27-18" appears underneath.

Handwritten note written in black, pink, and red marker on the back of page from a Staples calendar. The note contains quotes from Ecclesiastes and the South African Jewish philosopher, David Benatar. The quotes articulate the philosophical perspective, championed by Benatar, that procreation is not ethical.

Folded card with handwritten messages on white paper. The front cover reads: "Love," written in colorful bubble letters. The inside reads: "Your brothers and sisters in Aspinwall love you very much."

Handwritten card in colored pencil on paper. The card features a large tree resting on grass in the lower center and reads: "We're thinking of you Tree of Life." It is signed: "[Lov]e Shayna and West Orange, NJ."