As visitors wander through a mile-stretch of Filoli’s Natural Lands this summer, they’ll encounter a group of eager wooden characters ready to share their wisdom. Trolls: Save the Humans is a playful, yet urgent exhibition by Danish artist Thomas Dambo (previously), who’s known for creating enormous fairytale characters from reclaimed wood.

At Filoli, Dambo has installed six creatures, each with a distinct personality and agenda. There’s the innovative “Kamma Can,” a “treasure troll” that enjoys teaching people to turn their leftover wrappers and disposable containers into vibrant creations. “Ibbi Pip: The Birdhouse Troll” is similarly concerned with transforming the environment by installing avian homes, while “Sofus Lotufs: The Listening Troll” directs our attention to the forest floor and asks us to be mindful of the changes happening all around.

“I’m so happy my Trolls get to spend some time amongst the giant redwoods at Filoli,” Dambo says. “I spent a day hiking in the forest, and it is a magical place where I know my Trolls will feel at home.”

Staggering in stature and inviting in presence, the characters are activists at their core and passionate about teaching sustainability. Like much of the artist’s practice, this exhibition utilizes the charm and wonder of fairytales to convey critical messages about the climate crisis and human behavior.

Trolls continues through November 10 in Woodside, California. Follow Dambo’s passionate personalities on Instagram.