Note addressed to Jerry Rabinowitz written on the back of a business card from Doug [last name redacted], a certified Pilates instructor in the Pittsburgh area.

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.

Floral tag from floral arrangement, which reads: "May they Rest in Peace." The message is written in blue ink on a printed tag with multicolored flowers in the lower right corner. The reverse is stamped with the contact information for Squirrel Hill Flower Shop.

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.

Card addressed to Richard Gottfried, written using personal details from various public sources.

Card made by a student from the George Washington University Hillel. The card reads: "From our community at GW, you are in our hearts. We pray for better days to come, for mitzvot (good deeds) in honor of those lost, for actions of light to crowd out darkness in Squirrel Hill and beyond."

Clay pot containing white flowers with bow tied around stems. Bow made of gold-trimmed wired ribbon with multicolor leaves.

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

Post-it note with handwritten message and illustrations in green, blue, red, and black marker. The message reads: "He watching over Israel slumbers not nor sleeps." An illustration of houses on a hilltop with a river, trees, heart, and a moon and stars above, appears around the text.

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."

Handwritten card from a student at Goddard Middle School in Littleton, Co. The cover contains the following quote: "The past cannot be changed. The future is yet in your power." An illustration of three stick figures raising their hands, standing on a large rock with a Star of David at the center, before a mountainous landscape with a large sun and clouds, appears on the bottom center. The inside reads: "Dear Rabbi Jeffrey Myers, I'm very sorry about what has happen[ed]. I do know that people are also very sorry.

Post-it note with handwritten message in blue marker. The message reads: "Love with [will] always win in a war against hate. -Simon [last name redacted]."

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

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.

Handmade card in colored marker on paper. The front of the card features the word: "LOVE" in bubble letters; the letter "o" has been replaced with a large Star of David. Several smaller hearts and a multi-colored asterisk appear throughout. Signed, upper left: "Rylee Love." The back is signed, twice: "Love Rylee" in orange and purple marker, respectively. The card has been laminated.

Handwritten note written in purple marker on white paper reading: "We are all praying for you on this tragic day." Signed by the Yu, Kaufmann, and Bernstein families. Color bleeding due to exposure to the elements at the Wilkins memorial.

Handmade poster on blue cardboard paper. Inscription in black marker on square sheet of yellow paper with orange overtones in upper center; green and white paper crane lower left corner. Painted handprints and paper hearts throughout. Blank back. Laminated with translucent masking tape.

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."

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