The award-winning author Marta Sanmamed is a plastic artist, writer, and cartoonist from Madrid and has exhibited not only in Spain but also in the US and Europe, and her work is part of prominent Museums and Private Collections. For over a decade, she has been committed to Residualism to "create from waste without generating more waste" and within this movement are vertical Giardinos, woven from reused plastic bags. She firmly believes that Residualistic Art is the reflection of the human awakening towards a conscious, compassionate, understanding, honest, grateful, and respectful way of life with nature and tries to dignify creativity aimed at the preservation of our ecosystem. Her book Cyparissus (Cuento de Luz, 2015) has been translated into more than five languages and has been awarded by the prestigious IPPY AWARDS, Living Now Books Awards, and the International Latino Book Awards.

Sonja Wimmer loves painting pictures and telling stories. After studying and working for some years as a graphic designer in her hometown of Munich and Brussels, she decided to pack her suitcase and move to Barcelona to study Illustration at the Llotja Arts and Crafts School. Since then, she lives between brushes and stories, working as an illustrator and freelance for publishers and other customers worldwide. She has received many awards for her work in the United States, most notably Gold Medal for Best Illustrator for The Word Collector.