The layout operation in which principal measurements and reference lines taken from a model are marked directly onto the marble block.
Tracciatura is the marking-out stage. Le voci del marmo documents the transfer of principal reference measurements from the model onto the marble block before surplus stone is removed.
Etymology
From Italian tracciare, “to trace, mark out, or lay out.”
Sculptor Notes
Tracciatura turns an invisible plan into visible information on the block. Good layout reduces uncertainty before the first irreversible cuts are made.
References
https://levocidelmarmo.sns.it/lista_video.php