Jonael van der Sloot is the heart and soul behind Spruitje's 'sustainable worlds'; miniature, self-sustaining ecosystems in the form of lamps, decorative interior pieces and more. These sustainable worlds need little to no maintenance and can - with the right care - last a lifetime. Each piece is unique and assembled personally by Jonael.

Jonael is also responsible for a few wonderful interior design projects, like SLA in Amsterdam, the Tolhuistuin (also in Amsterdam) and Bairro Alto in Lisbon.