To have the skill level to carve it in marble.... This sculpture below, " The veiled virgin" is  most impressive! l Notice the effect of transparency, from the Italian artist Giovanni Strazza of the nineteenth century.   Think of the epic difficulty of modeling a veil on a face of a material that is among the toughest on the planet; marble -- mineral hardness 3 on Friedrich Mohs scale.  Another problem is that nothing is added.   It is a sculpture made by subtracting.  To sculpt a figure, you take a block of marble and "simply take everything off that is not in the figure ."   And a few other large sculptures that have beautiful marble veils:           Think of the level of difficulty to carve without breaking it This is a monument to the father of Prince Raimondo Sangro Antonio (1685-1757) The Italian name of the monument Disinganno is often translated as " disappointment ". "Freedom of the spell " (after 1757 ) of Franschesko Kvirolo and is the most famous of his works - just look at  this netting. All made of a single piece of marble.  Kvirolo was the only Neapolitan master who accepted the challenge. Other great sculptors would not, believing that the network would break into pieces. Amazing master sculptors for centuries the art of precise cutting of the stone How about that texture of the skin in the sculpture by Lorenzo Bernini, which depicts the abduction of Persephone. Look at the finger pressures on the skin.   The sculptor was only 23 years old when he made it in 1621.    義大利雕刻家當時才 23 歲 (1621 年 )