Post-it note with handwritten message in green marker. The message reads: "Love Wins [heart]."

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 words of love and support. The church's contact information is included on the back of the envelope.

Post-it note with handwritten message in black marker. The message reads: "We will make the world a better place in the name of your memory."

Post-it note with handwritten message in blue marker. The message reads: "We will not be bystanders. We will take action. All of us have a role to play. Everyone can help."

White posterboard with inscription in black ink. Writing bleeds through to back.

Handwritten tag on green and white striped paper. A large piece of tape has been affixed to the tag.

Bilingual, laminated prayer card with the text of the Jewish "Traveler's Prayer" in English and Hebrew. This "Traveler's Prayer" card was purchased an Israeli Judaica website.

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 with floral and geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Printed signs in blue and green ink on paper. The signs urge the reader to "Show solidarity" and "stand up for our common values, today tomorrow and always." An illustration of three stylized people raising their hands appears in the upper center, surrounded by the words: "Kindness, Respect, Courage."

Handmade card on white paper. Eleven trees, illustrated in blue ink, appear in the center. The number 11 appears below, followed by a heart. The card reads: "For the 11 people that died. Love, Coleman [last redacted]."

Post-it note with handwritten message written in black marker. The message reads: "We are always with you. You are not alone. Be strong." A smiley face and heart appear below.

Paper cut outs in the shape of a tree trunk on brown paper. The first cut out is a smaller tree trunk with branches. The second is larger and features a Star of David illustrated in white and paint and topped with a blue band of paper on the top.

Eight photocopies of an image with the words "You Are Not Alone" printed in a rectangular object resembling a flag with bands, resembling woodgrain backing, on the upper and lower edges. Staining due to exposure to the elements at the Wilkins memorial.

Card made by a student from the George Washington University Hillel. Front cover reads: "We Are One" with an illustrated heart below. The inside reads: "The GW community sends prayers and holds your community in our hearts. We will find a way to come out stronger."

Note addressed to Dr. Jerry Rabinowitz reading: "I will miss your Hello and smile all my days at Shadyside Hospital. Kelly [sad face]." Written on notecard which was cut in half.

Cylindrical white ceramic vase containing two bouquets of blue synthetic hydrangeas. Vase is cracked down one side from top.

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 your loss. We will remember you. P.S. We will pray for you. Aden."