There was a unique requirement for making the holy trumpets, the Menorah and the Cherubs. What does this teach us?

In the Torah portion Beha’alotcha, we read about the holy trumpets that were used to announce the holidays and/or to call the people to war.

There was a unique aspect to the requirements of the trumpets: They had to be made from one single piece of silver. It must be hammered out.

There were two other utensils with the same requirement, which were the Menorah and the Cherubs.

What lesson can we learn from this unusual requirement placed on these three utensils?