We all have a special way to enjoy Christmas.
Even if we live next to each other, we probably don't celebrate the same way as the family next door but we all should share the joy, respect each other and enjoy the day as much as possible. No matter the age, the country or the gender and that's part of what gives Christmas the peaceful and special meaning it has.
The idea of the Christmas tree building is a way to represent the fact we all are living in Christmas time, we're connected by this day and fill it with happiness.
I felt it was important to include kids, adults, teens and seniors, because part of the concept is "we all celebrate", no matter the age or the country because feelings like happiness are universal.