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 and 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 poster with handwritten message in black ink reading: "Pittsburgh loves all our neighbors." The hashtag, "Pgh Strong" is written vertically in the lower left corner. Extensive color bleeding due to exposure to the elements at the Wilkins memorial.

Collage with a hand drawn tree in the center; leaves comprised of multicolored tissue paper. Handwritten messages in pencil and pink ink on either side of the tree.

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.

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 black marker. The message reads: "The neighborhood is with you." A heart appears below.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Please feel our love, our support and our commitment to peace in this world. Our church community holds you and your congregation in our hearts. Susan [last name redacted]

Post-it note with handwritten message in black marker. The message reads: "You are stronger than hate." Tape across the upper corners. Tearing due to exposure to the elements at the Wilkins memorial.

Synthetic white orchid and bamboo stalk in brown square pot.

Handwritten note written on paper with the letterhead of the North Side Public Safety Council. The note reads: "Sharing our sincerest sympathies" and is signed by the officers of this council. A map of the various neighborhoods in the North Side and a blue line design below.

Miniature New York State flag. Wrapped around stem of flag is a slip of laminated yellow paper reading, "In Memory of our Brother JERRY RABINOWITZ z''l -- To his family and community we pray Tanuchamo min hashamayim. May God in Heaven comfort you. The Principals, Teachers, Parents, Alumni, and Students of Magen David Yeshivah. Brooklyn, NY." Part of a series of 11 flags, each dedicated to one of the victims. Additional photograph shows the entire set of 11.

Single page flyer. Backdrop features images of paper dolls holding hands and the image of a lit candle. Text lists date, time, and location of event, biography of speaker, and sponsoring organizations.

Miniature New York State flag. Wrapped around stem of flag is a slip of laminated yellow paper reading, "In Memory of our Brother In Memory of our Brother SYLVAN SIMON z''l -- To his family and community we pray Tanuchamo min hashamayim. May God in Heaven comfort you. The Principals, Teachers, Parents, Alumni, and Students of Magen David Yeshivah. Brooklyn, NY." Part of a series of 11 flags, each dedicated to one of the victims. Additional photograph shows the entire set of 11.

Post-it note with handwritten message in black and red marker. The message reads: "If you mess with us. You mess with the entire world." Signed with a heart, colored in red and outlined in black.

Oral history of Rabbi Aaron Bisno, recorded as part of the Meanings of October 27th Oral History Project.

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.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "To my Jewish brothers and sisters: I just want you to know that my prayers and love are with you. I cannot imagine your thoughts or emotions, but I am angry and saddened. No matter what I will always be with you. Joel D. San Diego 11/2/18."

Oral history of Rosalind Chow, recorded as part of the Meanings of October 27th Oral History Project.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Be Strong" and other floral and geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Handwritten note written in black marker on white paper with the first names of the eleven victims of the October 27 attack. Creasing and staining due to exposure to the elements at the Wilkins memorial.