When the students return, they will find all of the belongings they left behind when teachers and police evacuated them from Sandy Hook nearly three weeks ago. They will also find the classrooms and hallways decorated with paper snowflakes made by other students from across the globe.
"There are snowflakes from around the world there. There are many snowflakes, and they are beautiful," Robinson said.
So many, in fact, that organizers have asked that no more be submitted.
"At this time, we have enough beautiful snowflakes to blanket the community of Newtown," the Connecticut PTSA said in a message to prospective decoration contributors.
Attack motive still unknown
Meanwhile, no new details have emerged in recent days to explain why the 20-year-old Lanza, armed with a semi-automatic assault rifle, two other firearms and hundreds of rounds of ammunition, targeted the grade schoolers and their teachers.
Described by family friends as having Asperger's syndrome, a form of autism, Lanza shot and killed his mother, Nancy Lanza, at their home about five miles from the school before driving to Sandy Hook and embarking on the massacre, police said. He then took his own life as police were arriving at the school, which had an enrollment of 456 students ages 5 to 10 before the attack.
Police have offered no firm motive for the attack, and state police investigators have said it could be months before they are in a position to offer a report on it.
The massacre in Newtown, a rural New England town of 27,000 residents about 70 miles northeast of New York City, stunned the nation, prompting President Barack Obama to call it the worst day of his presidency and reigniting an extensive debate on gun control. In response to the attack, the National Rifle Association called for armed guards to patrol every public school in the country.