Floral tag from floral arrangement sent in memory of Al Hess. The note is printed on a tag with a beige background from a local florist.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a bird feather with geometric motifs. The back contains a handwritten note, which reads: "I'm sorry for your loss and I know what it like to lose someone dear to you but it is ok they will always love you no matter where you or the[y] are. -Owen H." The stock signature: "From your friends at West Allegheny Middle School," appears upside down on the upper right.

Post-it note with handwritten message in green marker. The message reads: "I miss Bubbie."

Folded card with marker illustration. Cover shows two balloons, a heart, and smiley face. Inside reads: "I hope everything gets better. I hope this never happens again. We are here for you." Signed with a heart.

Hand painted card. The card contains the Stronger Than Hate symbol with a yellow Star of David on the left. The words: "Stronger than Hate" appear in a black text box to the right. A heart appears above.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Don't Stop Believing." The back contains a handwritten note featuring a quote from the Brazilian author Paulo Coelho, as well as the stock signature: "From your friends at West Allegheny Middle School."

Prayer card with the words of a prayer to be recited every day at high noon. The prayer reads: "O God of mercy, give us peace. Peace in our hearts. Peace in our homes. Peace in our community. Peace in the world." Staining due to exposure to the elements at the Wilkins memorial.

Card made by a student from the George Washington University Hillel. The card features a Star of David and reads: "To the Pittsburgh community, We are a city built on steel and kindness and held up by a thriving Jewish community. I miss my home, my city so much right now, but I know that you are strong. I send all my love."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear Members and Friends of the Tree of Life Synagogue, I am sorry for your loss in the recent shooting. Our prayers are with those affected by the attack and we hope that everyone injured is able to recover. Sincerely, Ben from the Point Loma Community Presbyterian Church in San Diego."

Floral tag from floral arrangement sent by the Alexander family. The tag reads: "Wishing you all peace" followed by two hearts. Message handwritten in blue ink on a printed tag with a red border and a floral bouquet on the lower left.

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.

Silver box with metallic polka dot lining used to hold the cards sent by students at West Allegheny Middle School in Imperial, Pa. A handmade card with a tree at the center glued to a green ribbon is tied with a bow in the center. The tree trunk is adorned with a banner, reading: "Please take what you need" and is signed: "West Allegheny Middle School" with a heart.

Post-it note with handwritten message in black marker. The message reads: "What happened here will not be forgotten." Signed with a Star of David.

Post-it note with handwritten message in red marker. The message reads: "Hate is not welcome here." Tape on the upper edge.

Post-it note with handwritten message in black marker. The message reads: "No words! RIP." Stain in the upper right corner due to exposure to the elements at the Wilkins memorial.

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.

Paper cut outs in the shape of a tree trunk on brown paper. The first cut out is a smaller tree trunk with branches. The second is larger and features a Star of David illustrated in white and paint and topped with a blue band of paper on the top.

Brown envelope with handwritten note in black ink on a rectangular emblem, reading: "In Memory." Staining and creasing due to exposure to the elements at the Wilkins memorial.

Floral tag addressed to Melvin Wax. The tag features a white rose on the left and the stock message: "With Deepest Sympathy" in a band on the upper center.