It is staple but not an art. They're just tilings.

What the Spanish, Moroccan and Portuguese do with azulejos / zellij is miles ahead. It is intricate, complex and beautiful.

Those countries just take the think into crazy high levels of beauty. Brazilian azulejos are not in the same league.

To say that Brazilian azulejos are the same as the Moroccan/Spanish/Portuguese is like saying that a Ferrari Testarosa is the same thing as a VW Beetle (Fusca), that a Fugue by Bach is the same thing as Funk Carioca, that a Crepe Suzette is the same thing as a pancake with orange jelly: technically correct but still absolutely wrong.

[1] https://www.google.com/search?q=zellij+morocco&sxsrf=APpeQns...

[2] https://www.google.com/search?q=azulejo+sevillano&udm=2&sxsr...