A transparent basin is the only sink that takes up no visual space. Light passes through it rather than stopping at it, so in a small bathroom or a powder room where a solid vessel would crowd the counter, a clear basin gives you the sculpture without the mass.
It is the most demanding finish to live with, and worth being honest about. Everything is visible: the water line, the drain body underneath, and every mark on the glass. In exchange you get something no opaque basin can do, which is a bowl that changes with the light in the room through the day.
Choose the drain carefully here, because on a clear basin it is not hidden. It is part of the piece, and a mismatched one is the first thing anyone notices.
