Working with stones

The Three Weeks is an annual mourning period that falls out in the summer. This is when we mourn the destruction of the Holy Temple and our launch into a still-ongoing exile.
The period begins on the 17th of the Hebrew month of Tammuz, a fast day that marks the day when the walls of Jerusalem were breached by the Romans in 69 CE.
It reaches its climax and concludes with the fast of the 9th of Av

Working with stones such as building and writing during the beginning of the month od Av,  it reminds of the stones of the Temple,of the stones to rebuilt IT, of the stones of the Kotel.