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

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 inside reads: "Sorry for what happen on Saturday. I prayed for you. Love, Holy Angels CCD." Color bleeding due to water exposure at the memorial site.

Rectangular lantern box with wood frame and glass panels. Lantern contains electric candle. Back panel is translucent and features image of a tree. Attached to the handle of the lantern is a bow and a bouquet of white lilies. Front panel features text reading, "Memories. They remind us of people and things we hold dear. They bring smiles, laughter, and sometimes tears. No matter what others may do or say, nothing will ever take these memories away. Memories are more than just a link to the past, sometimes they're all we have that will last."

Clay pot containing white flowers with bow tied around stems. Bow made of gold-trimmed wired ribbon with multicolor leaves.

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."

Hand painted sign on paper cutout with various motifs, including Stars of David, the Stronger Than Hate Steelers' logo with the Star of David, and a peace symbol. The word, "love" is written in white ink with a streak of blue and white paint.

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.

Hallmark card from a member of St. Peter's Episcopal Church in Londonderry, New Hampshire. The envelope features an illustrated heart. The front cover reads: "Peace" and features a sandy landscape with a blue sky and orange flowers. The inside reads: "May you find peace in God's love; and be able to go forward and heal in his Glory. Ann [last name redacted] St. Peters Episcopal Church Londonderry, NH."

Hallmark card from a member of St. Peter's Episcopal Church in Londonderry, New Hampshire. The envelope features an illustrated heart. The front cover reads: "Peace" and features a sandy landscape with a blue sky and orange flowers. The inside reads: "We are sending you so much love- and will stand with you in peace forever- with you in peace. Steve and Bailey."

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front and back cover contains the following quote attributed to the medieval Persian poet, Rumi: "Don't grieve, anything you lose comes around in another form." The words in the quote are overlaid with red, green, and blue shading. A large Star of David enclosed by three circles appears below. The upper flap inside reads: "Just because the light stopped shining, doesn't mean we're stuck in darkness. The moon comes out, but the sun still comes up every day.

Typed Hebrew letter from a student at Hebrew Academy, a private Jewish day school in Montreal, Quebec. Translated into English, the letter reads: "Dear Rabbi from the Tree of Life Congregation, My name is Hannah [last name redacted]. I am a student at Hebrew Academy of Montreal. I am truly sorry about what happened to your holy synagogue. I hope that this will not happen again. I give [?] all your family and loved ones of your synagogue."

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 inside reads: "Dear Tree of Life members, I'm sorry for all of the uncalled for events and all of the inconvenience of them. We hope you all feel better and don't worry but keep them in mind. Sincerely, Michaela [last name redacted] from Holy Angels CCD."

Post-it note with handwritten message in black marker. The message reads: "Love is stronger than hate."

Folded card on yellow paper with red and green stains. Due to exposure to the elements at the Wilkins memorial, the message on this card is no longer visible.

Large square card from a student at Fountain Valley School in Colorado Springs, Co. Card features several messages on paper heart cut-outs. Message on upper left heart: "Dear members of Tree of Life Synagogue, I'm from China. I heard about the tragic news that happened on October 27th. I'm sorry for your loss..." Message on upper right heart reads: "I'm Christian, and I'm with you. Wish you all the BEST... I stand with you.

Black and white laser print with the Stronger Than Hate symbol on the front; Pittsburgh Penguins symbol with Star of David on the back.

Typed text on yellow paper, four pages. Includes introductory article from Rabbi Aaron Bisno and details about upcoming congregational events.

Post-it note with handwritten message in green marker. The message reads: "May your memories be forever a blessing and may the Holy One hold in his Heart forever."

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