Black poster with "Stronger Than Hate" written in white ink. An illustrated heart outlined in white ink with the letters "Pgh" written inside. Warped from water damage; dirt on the back due to exposure to the elements at the Wilkins memorial.

Letter from administrators and affiliated staff at The Center for Global Understanding and Peacemaking at Elizabethtown College. The front of the letter is inscribed with letterhead from the The Center for Global Understanding and Peacemaking at Elizabethtown College. Message reads: "Elizabethtown College's Center for Global Understanding and Peacemaking shares our concerns and prayers for your community at this sad and difficult time.

Handmade cardboard poster with black, red, blue, yellow, and green ink, reading: "Stronger Than Hate." The Stronger Than Hate Steelers' logo with the yellow Star of David appears in the center. The reverse, written in purple, pink, blue, and blank ink, reads: "No way to prevent this- says only nation where this regularly happens."

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of a haloed dove flying in front of Noah's ark. The card reads: "Tree of Life Synagogue" and contains the following note: "TREE OF LIFE, I am very sorry for your loss. I send prayers that it gets better. I pray for your loved ones. Holy Angels, 6th grade, Brooklynn."

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: "We love you! God is with you always!" The church's contact information is included on the back of the envelope.

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.

Folded card with colored pencil illustration. Front shows a tree in autumn with grass and falling leaves. Inside reads: "Nobody deserves to go through what you are going through. Best wishes to all. Love [heart] Beth Chai."

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 blue marker. The message reads, in Hebrew: "May their memories be for a blessing. May their souls be bound with the bond of life. Sharon, Israel."

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.

Large bound volume. Cover features gold writing embossed onto white leather and reads, "Book of Life, New Light Sisterhood, Donated By Mr. and Mrs. Harold Marcus in memory of Herman L. Katz." Interior pages contain handwritten messages in calligraphy.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Keep Going" surrounded by stars, arrows, and other floral motifs. The back contains a handwritten note, featuring a quote from the British historian, Richard Evans, as well as the stock signature: "From your friends at West Allegheny Middle School."

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.

Plastic Ziploc bag with multicolored blue, red, and yellow ribbons tied into a bow on the upper right corner. Staining and dirt due to exposure to the elements at the Wilkins memorial.

Zine page with bubble letters and information about the emotional value of hugs. Zine page with cartoons illustrating the emotional value of hugs, including a superhero, labeled "Hugs to the Rescue" and a young couple.

Card with flying dove holding an olive branch in its mouth over a navy blue background with light blue tendrils on the front cover. The word "Peace" appears below the dove. Handwritten note in blue marker from Kelly M. from Freedom, Pa.

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 letter is dated Oct. 28, 2018 and contains words of condolence and prayer. The church's contact information is included on the back of the envelope.

Post-it note with handwritten message in blue marker. The message reads: "As a result of this hate, I'm committing to discovering my Jewish identity and am doing micro-kindness."