The floor in front of the cenotaph sarcophagus contains fragments of the original Byzantine floor mosaics, which were executed in the ‘opus sectile’-technique.

Opus sectile is an art technique popularized in the ancient Roman and medieval world where materials were cut and inlaid into walls and floors to make a picture or pattern. Common materials were marble, mother-of-pearl, and glass. The materials were cut in thin pieces, polished, then trimmed further according to a chosen pattern. Unlike tessellated mosaic techniques, where the placement of very small uniformly sized pieces forms a picture, opus sectile pieces are much larger and can be shaped to define large parts of the design.

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Bursa – Turquie’ – booklet of the Bursa Müzeleri, 1980 & Wikipedia