What is the fine-grained topic of the following text: Very Art Déco at the outset, (his Le Tumulte Noir, ‘The Black Craze’ is a masterpiece of the genre), his style quickly became highly personal and impossible to categorize: the synthetic accuracy of his portraits, the evocative force of his posters for grand causes so marked him as a master of visual communication that his work today remains relevant and fresh. Only return the topic.
The individual style and lasting relevance of an Art Déco artist's work.