Collage with a hand drawn tree in the center; leaves comprised of multicolored tissue paper. Tree trunk is shaded with purple crayon and outlined in black ink; handwritten messages in fuchsia ink and pencil on either side.

Post-it note with handwritten message in blue marker. The message reads: "You are loved. You are stronger than hate. Love and more love."

Zine page with bubble letters and information about the emotional value of hugs. Zine page with cartoon imagery and information about the value of hugs. A young boy hugs a globe, beneath the inscription: "Embrace the world one hug at a time."

Pink card with a large heart with the words "Rose-Ferree Street misses you" inside.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "I am so sorry for the loss in your community. I hope you know there are many in our church and community who support you in your loss with our prayers."

Card with the words: "My heart is with Squirrel Hill" on the front cover. The message inside is from a life-long Pittsburgh resident with ties to Duquesne University, who writes: "I know that this is a city of incredible love and acceptance, which just makes this tragedy hurt even more."

Card and envelope featuring hand-drawn image of dove. Message in card expounds upon the biblical association of the dove as a symbol of peace.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear Tree of Life Synagogue, Brothers and sisters, we love you and are praying for all of you in this difficult time. Love, The Pasha Family."

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

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated Nov. 4 and reads: "Dear Tree of Life Members, We send our love and sympathy to you. We stand by you and all your global family for life. You are our brothers and sisters cherished our heritage through your and our future promises with you. With prayers and love, Rev. Dr. Larry [last name redacted]."

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

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 from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a turtle with floral motifs on its shell, feet, and neck. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Handwritten note in black marker on white paper. The note reads: "We are with you. We are all Pittsburghers. HATE WILL NEVER WIN." Tearing and staining due to exposure to the elements at the Wilkins memorial.

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 affirms God's support and contains prayers for the families and community. The church's contact information is included on the back of the envelope.

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

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: "Dear You, I have so much I could tell you, but what I want to share with you is a feeling. I want you to always feel God's love for you! I know sometimes (many times) God's love feels hidden. Where is love's light in our times of darkness? Two things help me to remember God's love each day. I hope that they can help you too.

Rectangle-shaped card from a student at Fountain Valley School in Colorado Springs, Co. Card reads: "Dear members of Tree of Life synagogue. I am an international student from China. I am sorry for your loss and will stand with you. May peace with you and stay stong. Shalom. Warmly, Xiao Chao [last name redacted]." Small Star of David in lower right.

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."