Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a mandala with floral motifs. The back contains a handwritten note featuring a quote from the nineteenth century American poet, Emily Dickinson, as well as the stock signature: "From your friends at West Allegheny Middle School."

Handmade card illustrated in pink and blue colored pencil featuring assorted hearts in varying shapes and colors. Color bleeding due to exposure to the elements at the Wilkins memorial.

Printed tag with a photograph of Irving Younger. The tag reads: "In Memory of Irving Younger." Creasing and staining due to exposure to the elements at the Wilkins memorial.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the word: "Smile" and other floral and geometric motifs. The back contains a handwritten note in fuchsia pencil, reading: "I've lost loved ones I care about and know how hard it is. Please know I am thinking about you and I'm sorry for your loss." The stock signature: "From your friends at West Allegheny Middle School" appears on the bottom right.

Card from the Friendship Circle of Illinois. The card reads: "Baruch [redacted]. To the Jewish community of Pittsburgh sheyichyu (may they live), I'm so sorry about what happened. I am going to bring and wash my hands in the morning in honor of all those people who passed away." A smiley face with a yarmulke (skullcap) with Hebrew letters appears below. The Hebrew acronym "B"H" (Bless God/Thank God) appears in the upper right. Spelling errors corrected for clarity.

Post-it note with handwritten message in green marker. The message reads: "To never be silent at the arms of our oppressors."

Hand painted, laminated sign with the words: "May their memories be a blessing" in black paint." Eleven yellow candles with orange flames, symbolizing the eleven victims of the October 27 attack, appear below.

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.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Please know that our thoughts and prayers are with you and your congregation during this most difficult time. We here in San Diego pray for your healing. Jeanie."

Handwritten note written in blue ink on lined paper from Jessica and Aron [last names redacted] from Ridgewood, NJ. Staining due to exposure to the elements at the Wilkins memorial. The back of the note features advertising for Market Central, one of the largest dining halls on the University of Pittsburgh's campus.

Post-it note with handwritten message in blue marker. The message reads: "My heart, my grief, my compassion, and my best wishes are with all of you. Love, Cherlz from L.A."

Rectangular card from a student at Fountain Valley School in Colorado Springs, Co. Front reads: "Tree of Life" and features a Star of David and a peace sign. Back reads: "Dear members of Tree of Life: I'm a Chinese high school student who study in U.S. After I heard the news that what happened in Tree of Life at this weekend. I'm extremely shocked and I still cannot believe that. We really against the discrimination between the religions and I believe that hate is no allowed between religions.

Printed note on behalf of Jerry Rabinowitz. The note contains photographic illustrations of a bicycle, fanny pack, and whistle. It reads, in blue letters: "Our Friend Jerry."

Post-it note with handwritten message with blue marker. The message reads: "Never Forget. Love from D.C."

Postcard with a monumental building with a dome, perhaps a mosque, from Azerbaijan on the cover. Tearing due to exposure to the elements at the Wilkins memorial. The message on the back contains words of prayer and the senders' commitment to welcoming all in Squirrel Hill.

White envelope with a handwritten note in blue ink, reading: "To Our Jewish Friends and Neighbors." Staining, color bleeding, and minor tearing due to exposure to the elements at the Wilkins memorial.

Post-it note with handwritten message in black marker. The note is written in Hebrew. Translated into English, it reads: "Be strong, be strong, and may we be strengthened!"

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.