A hand with tweezers sets a gold tessera into a circular mosaic, beside trays of stone and glass tesserae.

Handmade objects and craftsmanship

Mosaic

Mosaic is a mathematics of light. Thousands of small fragments — stone, glass, enamel, gold — set one by one according to geometric and pictorial rules, bring out images that change as the lighting changes. It is a very ancient art — Rome, Byzantium, Ravenna — that Tuscany has practised in its own original forms, above all in the variant known as commesso fiorentino: hardstones cut and fitted together to imitate oil painting.

A stone square with a Romanesque church front decorated by rose windows and geometric bands of inlaid marble.

Where

Where it is practised in Tuscany

In Tuscany mosaic lives on two distinct traditions. The first is commesso fiorentino: born in the sixteenth century under Medici patronage, it had its temple in the Opificio delle Pietre Dure in Firenze, still today a world reference institution for restoration and training. The commesso uses lapis lazuli, agate, jasper, malachite and carnelian — hardstones cut wafer-thin and fitted together with no play of mortar, so that the composition looks painted. It is an elite craft, traditionally at the service of noble patrons and today of private clients of the highest profile. The second tradition is classical mosaic in tesserae — natural stone, enamel, Venetian gold glass — used for the restoration of ancient mosaics (Roman floors, medieval decoration) and for contemporary works. Active workshops are found above all in Firenze and to a lesser extent in Pisa, Siena, Lucca.

A mosaic hammer and hardie on a wooden block beside a tray of coloured tesserae, a bowl of grout and a brush.

How

The techniques of the craft

The techniques define different worlds. In commesso the hardstone is cut with an abrasive-wire bow saw, along precise geometries calculated on the preparatory drawing; the stones are chosen for colour, for veining, for the direction of the cut (so that the natural patterns of the stone enrich the composition); they are glued onto a stone base, and the finish is a polishing measured in fractions of a millimetre. In tessera mosaic the hammer cut — cutting the tessera with martellina and tagliolo — is the fundamental gesture; the tesserae are laid on a preparatory drawing either directly (on fresh mortar) or indirectly (on paper, then transferred); the finish includes grouting and polishing. The emblema — a prefabricated movable panel — makes it possible to work in the workshop on pieces destined to be installed on site.

A mosaicist works at his bench under a lamp, a large panel in progress before him and shelves of jars of tesserae behind.

Now

The craft today

Doing it today is a niche of the highest specialisation. Commesso fiorentino lives on museum commissions, restoration, institutional gifts of representation, and unique works for collectors. Classical mosaic has a market in public restoration (churches, villas, historic buildings) and in contemporary works for luxury interiors, hotels and fine private houses. It is an extremely slow craft — a square metre of fine mosaic can take weeks of work — and therefore expensive, but those who look for it really do look for it. The real workshops combine their own production, restoration on commission, and the training of young people.

The producers of this craft

No producer of this craft has yet joined the MANUARTI network. This list opens when the first one arrives.

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