The Vincennes Zoo Display: Why Paris Put a Slime Mold on Perpetual Exhibition

In October 2019, the Zoo du Bois de Vincennes (the Paris Zoological Park) made international news with the unveiling of its newest star attraction. It wasn’t a rare mammal or a colorful bird; it was a shapeless, yellow goo kept in a series of dark, humid boxes.

The arrival of the blob marked the first time a major metropolitan zoo dedicated a permanent, high-profile exhibition to a single-celled organism. It signaled a shift in how museums and zoos view the “animal” kingdom—expanding the boundaries of public fascination to include the world of protists.

Why Put a Slime Mold in a Zoo?

Zoos are traditionally places for animals with brains, limbs, and recognizable behaviors. So why did Paris find the blob worthy of a permanent spot?

1. Challenging the Definition of Life: The blob exists at the intersection of animals, fungi, and plants. By displaying it, the Vincennes Zoo encourages visitors to question the “tree of life” and recognize that intelligence doesn’t require neurons.
2. Scientific Rock Star Status: Following the work of researcher Audrey Dussutour, the blob became a cultural phenomenon in France. The public was hungry to see the “brainless genius” in person.
3. Visual Fascination: Under time-lapse photography and museum-grade lighting, the throbbing veins and “shuttle streaming” of the blob are as visually captivating as any large predator.

The Technical Challenge of the Exhibition

Displaying a slime mold to the public is notoriously difficult. Unlike a lion, which stays in its enclosure, a blob is a master escape artist and highly sensitive to its environment.

• Lighting: The display must be kept primarily in the dark. Blobs are light-averse (photophobic). Visitors at the Vincennes Zoo must often press buttons to illuminate the cases for short bursts of observation.
• Humidity: A constant 90% humidity is required to keep the blob active. The zoo uses high-precision environmental control systems to prevent the blob from entering its dormant sclerotia state.
• Dietary Logistics: The zoo keepers must feed the blob daily, usually with a standardized diet of oat flakes, and manage the inevitable fungal and bacterial growth that comes with a high-moisture environment.

A Global Cultural Shift

The Vincennes exhibition was more than a local curiosity; it was a PR victory for microorganisms. It proved that the public is just as interested in basal cognition and network optimization as they are in pandas and tigers.

Since its opening in 2019, the blob has become one of the most talked-about residents of the Paris Zoo, proving that sometimes, the most interesting things in the world are the things we can only see if we look very, very closely at the forest floor.

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Planning a trip to Paris? Make sure to visit the Zoo de Paris to see the blob in action. In the meantime, start your own exhibition with our Home Lab Hub.

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Origin and E-E-A-T

• Source: Le Monde: “Pourquoi le blob fascine les scientifiques.”
• Institution: Paris Zoological Park (Zoo du Bois de Vincennes).
• Dates: Permanent exhibition desde October 2019.