What is zellij? A guide to Moroccan tile work

Zellij is the cut-tile mosaic tradition of Morocco and Andalusian Spain. Geometric tiles in glazed terracotta are hand-cut into precise polygons, then bonded with plaster onto walls, floors, fountains, and architectural features in patterns that can be traced to specific mathematical rules. The word is spelled zellij, zellige, or zillij in English depending on the source; all three refer to the same tradition, which has been produced continuously in the cities of Fez, Meknes, and Marrakesh for roughly nine centuries.

This guide covers what zellij is, how it's made, the signature patterns that define the tradition, where to see it today, and how it compares to other Islamic tile traditions like Persian kashi. The substance draws on Wichmann and Wade's Islamic Design: A Mathematical Approach, Castéra's Arabesques: Decorative Art in Morocco, and Paccard's Traditional Islamic Craft in Moroccan Architecture, plus working knowledge from my own practice in layered paper geometry that draws on the same pattern family.

The short answer

Zellij (also spelled zellige) is a hand-cut ceramic tile mosaic tradition native to the Islamic West — Morocco, Andalusian Spain, and parts of Algeria and Tunisia. Tiles are cut from glazed terracotta into specific polygons (squares, triangles, kites, 8-pointed stars), then arranged into geometric patterns and set in plaster. The tradition emerged in the 12th–13th centuries under the Berber dynasties and is still produced today in Fez, Meknes, and Marrakesh.

How zellij is made

The process has barely changed in eight hundred years.

1. Glazed terracotta is fired. Square tiles measuring roughly 4×4 inches are made from clay native to Fez, fired, then glazed in solid colors and re-fired. Traditional palettes used white, black, honey-brown, deep blue, green, and saffron yellow; modern zellij has expanded the color range significantly.

2. Tiles are hand-cut into shapes. This is the part that defines the craft. A master craftsman called a maâlem uses a sharp chisel (menqach) to cut each tile into a specific polygon — most commonly the 8-pointed khatem star, kites, triangles, and 16-pointed petals. The cuts are guided by a wooden template called a ferrah, and the work is done by feel and eye rather than by measurement. An apprentice spends years learning to cut a single shape before moving to the next.

3. Patterns are composed on the ground, glaze-side down. The cut tiles are arranged in a sand box or on a flat surface with the glaze facing down. The craftsman composes the pattern in reverse, building from the center outward. Patterns are typically based on a rosette structure with the khatem at the center.

4. Plaster is poured over the back. Once the pattern is composed, a layer of wet plaster is poured over the back of the assembled tiles, binding them into a single panel. When the plaster cures, the panel can be lifted and installed.

5. The panel is set into a wall or floor. Final installation uses mortar to attach the panel to a wall or floor surface. The glazed front face, with its precisely cut joins, becomes the visible surface.

The whole process is hand-done, no two panels are identical, and a single panel covering a 4×6 foot wall can take a team of craftsmen weeks to produce.

Etymology and spelling

The word comes from the Arabic root zalaja (to slide, to be smooth). Western writers have anglicized it inconsistently: zellij is the most common spelling in English-language academic writing; zellige is preferred in French-language sources and increasingly in design publications; zillij appears in some older Spanish-language texts. All refer to the same tradition.

A related Persian and Central Asian tradition is called kashi — also cut-tile mosaic, but with different palette, different signature patterns (decagonal rather than octagonal), and different regional concentration. For the Persian counterpart, see what is kashi — the Persian tile tradition.

The history

Cut-tile mosaic in the Islamic world traces back to the development of ceramic glazes during the 11th and 12th centuries, but the distinctive Moroccan-Andalusian zellij tradition consolidated under the Berber dynasties (the Almoravids and Almohads) in the 12th and 13th centuries. The cultural exchange between Morocco and Andalusian Spain during this period — Cordoba, Granada, and Seville were Muslim cities, with constant traffic of craftsmen across the Strait of Gibraltar — produced a shared visual language that endures.

The two greatest surviving expressions are:

• The Alhambra in Granada (built between the 13th and 15th centuries by the Nasrid dynasty), where zellij panels cover the lower walls of nearly every room. The Sala del Mexuar, the Patio de los Arrayanes, and the Sala de las Dos Hermanas contain some of the most studied examples in the world.
• The Bou Inania madrasahs in Fez (1351–1356) and Meknes (18th century), where zellij is integrated with carved stucco and woodwork in some of the finest surviving examples of Moroccan religious architecture.

After the Christian reconquest of Spain in 1492, the zellij tradition continued in Morocco and was largely lost in Spain, though Mudéjar workshops (Muslim craftsmen working under Christian rule) preserved related practices for another century. Today the tradition remains strongest in Fez, where many of the same workshops have operated continuously for generations.

The signature patterns

Zellij is geometrically constrained in ways that other Islamic tile traditions are not. The Wichmann and Wade book identifies an "octagonal set" of 140+ documented patterns built from a small family of shapes — most prominently the 8-pointed star known as the khatem, plus kites, triangles, and 16-pointed petals.

The defining properties of the octagonal set:

• The tiles are edge-to-edge. Neighboring tiles share exactly one edge, with no gaps and no overlaps.
• The patterns can be two-colored. Every pattern in the set can be colored with just two colors such that no two adjacent tiles share a color.
• All 4-way junctions cross over. Where four tiles meet at a corner, the lines pass straight through each other (creating the interlace pattern characteristic of zellij).
• Internal angles are multiples of 45°. This is what makes the octagonal set tractable mathematically and constructible by craftsmen working without precise measurement.

Of those 140+ documented patterns, 21% come from Morocco and 18% come from Spain — together more than a third of the global corpus of this style. The remaining patterns are distributed across Egypt, Iran, India, Syria, Central Asia, and Turkey, but in those regions other tile traditions (girih and kashi especially) are dominant.

For more on the iconic motif at the center of these patterns, see the khatem — the 8-pointed star at the heart of Moroccan tile work.

Where to see zellij today

If you have the opportunity to travel:

• Fez, Morocco — The Madrasa Bou Inania (1351), Madrasa al-Attarine (1325), Madrasa Sahrij, and the older parts of the Moulay Idriss zaouia. Fez is the working capital of zellij; you can also visit craft workshops in the medina to see tile being cut.
• Marrakesh, Morocco — The Saadian Tombs (16th century), the Bahia Palace (19th century), the Madrasa Ben Youssef.
• Meknes, Morocco — The Tomb of Moulay Ismail (18th century), the Bou Inania Madrasah of Meknes.
• Granada, Spain — The Alhambra. The single most concentrated collection of high-quality zellij anywhere.
• Seville, Spain — The Real Alcázar of Seville, much of which was commissioned by Christian King Pedro I but built by Muslim craftsmen in Mudéjar style.

Outside the Maghreb and Spain, original zellij is rare. Some museum collections hold panels (the Victoria and Albert Museum and the Met have significant pieces), but to experience the work in its architectural context, the cities above are the destinations.

Zellij vs other Islamic tile traditions

All three are cut-tile or tile-based mosaic traditions in Islamic art, but they're produced differently and look distinctly different in person. A visitor to the Alhambra (zellij), Isfahan (kashi), and Istanbul's Topkapı Palace (Iznik) sees three different traditions clearly.

Where my work fits

My own layered paper pieces draw on the zellij pattern family — same khatem star, same octagonal set, same Maghreb tradition — but executed in a contemporary medium. They're not zellij. They're a translation of zellij geometry into a different material that lets the patterns be made affordably for spaces where traditional tile installation isn't practical.

For more on the medium, see layered paper art — a contemporary medium for Islamic geometric design. For commissioning a piece in the zellij tradition (whether from me in layered paper or from a traditional craftsman in tile), see commissioning Islamic art.

FAQ

Is zellij the same as zellige?

Yes. They're two spellings of the same Arabic word — zellij is more common in English-language academic writing, zellige is more common in French-language and design publications. Both refer to the hand-cut ceramic tile mosaic tradition of Morocco and Andalusian Spain.

How long does it take to make a zellij panel?

A 4×6 foot panel can take a team of craftsmen several weeks to produce, depending on the complexity of the pattern and the number of colors. Cutting alone — done by hand with a chisel — accounts for most of the time. A single 8-pointed khatem star takes a skilled craftsman a few minutes to cut precisely; complex panels contain hundreds of individually cut tiles.

Can zellij be made today, or is it a lost art?

Zellij is alive and produced continuously in Morocco today. Fez is the working capital of the craft, with workshops that have operated for generations. The techniques are passed from master to apprentice as they have been for centuries. Buyers can commission new zellij work directly from Moroccan ateliers or through international representatives.

Why is zellij so concentrated in Morocco and Spain?

The Berber dynasties of the 12th–13th centuries developed the technique in the Islamic far-West (the Maghreb), and Morocco and Andalusian Spain remained linked culturally and politically for centuries afterward, with constant exchange of craftsmen. Other Islamic regions developed their own tile traditions — Persian kashi, Ottoman Iznik — that diverged from zellij in technique, palette, and pattern logic.

Sources

• Wichmann, Brian, and David Wade. Islamic Design: A Mathematical Approach. Springer, 2017. Chapter 9 documents the octagonal set of patterns.
• Castéra, Jean-Marc. Arabesques: Decorative Art in Morocco. ACR Edition, 1999.
• Paccard, Andrè. Traditional Islamic Craft in Moroccan Architecture. Saint-Jorioz, France, 1980.
• Met Museum essay, Tilework in Islamic Art.
• V&A Collections — search for "zellij" or "Hispano-Moresque" for example panels.
• Alhambra Patronato — official site with image archive.