Mosaic tiling is not just decoration; it's the only way to properly cover a curved surface

Take a sheet of paper and try to wrap it around a ball. You can't: there's excess paper on the sides, and it wrinkles. However, you can wrap it around a tube, because a cylinder curves in only one direction, and the paper can be rolled around it without wrinkling. That difference, which has a specific name in geometry, is the whole point.

The surfaces that Gaudí created curve in two directions simultaneously: the backrest of a bench that is both concave and convex in the same section, a column that widens, a bulbous top. Instead of a single tile supporting the surface, it rests on a single point and seems to dance. The breakthrough wasn't inventing a curved tile, which would have required a different mold for every inch of the work; instead, it was breaking existing tiles, many of which were factory rejects or broken tiles, and placing the pieces one by one until the surface was covered.

It's a technique more akin to masonry than to art. And that's exactly what you can learn in just two hours.

The material arrives in pieces, or it's broken up there on the spot using round-jawed pliers that grip the tile and break it, more or less where you want. That "more or less" is the first lesson: mosaic pieces aren't cut, they're broken, and then you look for where each piece fits. No one designs the piece beforehand. You just start placing them and see what emerges.

Next comes the application of the mosaic onto the base, and finally, the grouting: a white paste is spread between the tiles, allowed to set, and then cleaned with a sponge. That final step is what transforms a collection of pieces into a mosaic, and it's the part that everyone photographs.

Here are two points to note about that table. First: the highest price, not per person. It's a package designed for families of up to four people, so if you are four, it works out to less than 50€ per person, which is cheaper than the average price. This is exactly the kind of detail that a search engine sorted by price might misrepresent, and because of which someone might discard the best option they had.

The second: the six workshops together have a total of 357 reviews. This is a small number. None of them have a rating below 4.9, which is very good, but a rating of 5.0 with only four reviews doesn't really mean much. The two that have enough volume to be reliable are the two-hour workshop, with 194 reviews, and the one-hour workshop, with 94 reviews.

If you add up the reviews in the table, you get 357. However, at the top of the category, it shows 1,827. The difference of 1,470 reviews comes from a single listing, and that listing isn't a workshop; it's a package of tickets to Park Güell and the Sagrada Família, which ended up here due to how the provider categorized it.

We don't hide it because the consequences are evident. That package scores 4.3 and accounts for eighty percent of the reviews on the list, so it drags down the weighted average of the category to 4.42. The average of the six workshops, calculated in the same way, is 4.90. That's almost five tenths of a point difference between what the number at the top says and what people who attended a workshop actually experienced.

The product itself isn't bad. It's just in the wrong place, which makes a difference. If you were looking for a combined ticket, there's an entire page dedicated to that.

The mosaic work at Park Güell was not placed by Gaudí's own hands. The part that is most admired, the round medallions on the ceiling of the hypostyle hall, is the work of Josep Maria Jujol, a young architect who was working alongside him at the time, and who is rarely mentioned today.

Jujol created those panels using whatever materials were available: discarded ceramics, glass, broken tiles. They are made from factory waste and are among the best pieces in the park. And they are the best possible news for anyone entering a workshop who has never held a pair of pliers in their life, because they demonstrate that here, the material doesn't determine the outcome. It's where you place each piece that matters.

Jujol is rarely mentioned during guided tours. When a guide does mention it, it's usually a good sign.

If you leave the workshop eager to see the technique in action, there are three places where you can observe it, and none of them cost anything.

The first is the facade of Casa Batlló, viewed from the sidewalk across from Passeig de Gràcia. The glass discs and ceramic pieces are at eye level on the ground floor, while above, they form the iridescent surface that changes color depending on the time of day. The second is the spires of the towers of the Sagrada Família, which can be seen from Gaudí Square without entering the basilica. They are covered in Venetian mosaic and shine from a distance, which was exactly the intention. The third is the roofs of the pavilions at the entrance to Park Güell, which are visible above the fence on Olot Street, before reaching the ticket office.

With my hands still sticky from the grout, those three places look completely different. That's the best argument a workshop can have, and no certificate can replace it.