Intaglio printmaking can be dated back to the "Sumerian" people, around the year of 3000 BCE. The name itself however is relatively new, coming from the Latin "intagliare" which means "to cut"
Glass crafts are made by heating sand silica until it melts into a liquid state. The melted glass can then either be shaped by blowing the liquid glass or by pouring the melted glass into a mold. The shape and size of the finished piece depend on the tools and method used by the artist.
I believe the correct answer is: in semicircle.
Nanni d'Antonio di Banco was a sculptor from
Florence, Italy, whose significance lays in naturalism and individuality of the
figures in his artworks, but also the complexity of construction of a sculptures
which represent a group. He achieved unified spatial composition by placing the
figures in the semicircle and in relation to one another, such as sculpture “Quattro
Santi Coronati”.
The identified part represents an open string!:)