Folded card with marker illustration. Front and back cover features illustrations of heart superimposed on tree. Interior features illustration of rising sun and words "a chance for a new day" on one side and "You will get through. It will be okay! Jay [last name redacted for privacy" and a smiling face.

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."

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 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 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 Many of the letters in "Coexist" have been replaced by interfaith symbols, including the crescent moon, peace symbol, Star of David, yin-yang, and a cross.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.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "You Got This" surrounded by a border with a grapevine pattern. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Handmade, screen-printed card on red paper with blue paint. A heart appears in the center. Signed, lower right: "Love, Brian S." The card has been laminated. A piece of clear tape appears on the back.

Large envelope with a message written in pencil. Two flower outlines, drawn in purple, surround the text. Blank back.

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.

Post-it note with abstract illustration in blue and green marker.

Multicolored printed card with message that affirms the value of kindness.

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.

Post-it note with handwritten message in blue marker. The message reads: "The 2nd and imp[ortant] commandment is LOVE Your Neighbor. Susan." Tape on the bottom and top left. Tearing and dirt due to exposure to the elements at the Wilkins memorial.

Handwritten card in pink and orange marker on pink paper. The card reads: "Sorry for this tragedy. We love! Adeline." A large, striped, inverted triangle appears below the word "Sorry." Small hearts and peace symbols appear throughout.

Business card from Pastor J. Hogan of Faithbridge Community Church.

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: "God be with you!!! We are thinking about you and keeping you in our hearts. [Heart symbol]." The church's contact information is included on the back of the envelope.

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of seven children holding hands around a table with a large goblet and loaf of braided bread, and seven doves. The illustration is labeled: "We are people of God's peace." The inside reads: "Just because life is hard now...does not mean it will be forever challenging. Love in stronger than HATE. You just have to strong. We are praying. -Tree of Life members and all Jewish people. - From: Reena Weber and Holy Angels CCD, 8th grade." Illustrated with two small hearts.

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of seven children holding hands around a table with a large goblet and loaf of braided bread, and seven doves. The illustration is labeled: "We are people of God's peace." Signed "-Jenna [last name redacted]" in the lower right corner. The inside contains several messages, including: "We love [heart symbol] you... Get well soon!!!!... Get well soon... I'm praying for you...hope you get better...we hope you heal fast...get well soon.

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.

Metallic red rose with wire stem attached to a rock base.