Mosaic
Mosaic designs may be complete in themselves or be the result of repetition, according to attitude and purpose, and with regard to variety and colour, only restricted by æsthetic considerations.
No. 267. Boule Work. Period of Louis XVI.
Owing to technical limitations, modelling can only be broadly suggested; therefore forms should be generally in silhouette except when on a large scale.
When employed on walls and vaults, gold is frequently used in the backgrounds. This not only serves to define detail, but affords contrast to the general surface, the inevitable joints in the tessaræ adding also to the interest.