Two round openings, a curved grin, and no instructions. Twenty-five years after its 2001 debut, Bilibo still looks like a character waiting for a story. Swiss designer Alex Hochstrasser created the shell as a bilibo open-ended toy that can serve as a seat, a boat, a helmet, or a drum.
The Zurich-based toy company Moluk, which Hochstrasser runs with his sister Doris, an architect, marks the anniversary with two additions. Bilibo Midi is a smaller shell for toddlers. Bilibo Dots is a set of colorful counters that carry the original’s open-ended idea into a new form.
Both products rest on a premise that has carried Bilibo into homes, classrooms, and museum collections. Offer a simple object, then let the child decide what it is. Every Moluk product follows that logic, and the bilibo open-ended toy remains the clearest example.
Playful objects take many forms, and Basura and Big Data’s Toy Mocks Data Centres offers a humming, mischievous take on the idea.
Hochstrasser began the project after studying the shelves of toy stores around the turn of the millennium. He saw mainstream toys sorted by age and gender, which made them obsolete long before they wore out. He also saw a glut of licensed products that arrived with a plot already attached. He wanted an open-ended toy that could grow with a child.
Hochstrasser shaped the toy through close observation of children at play, repeated rounds of testing, and advice from child-development specialists. He treated the final stage as the children’s job. In his view, they become co-inventors who decide what the object is and what it can do.
How Bilibo took shape
Early sketches drew on forms found in nature, including eggs and turtle shells. Hochstrasser focused on how a hollow hemisphere changes its behavior when it is flipped. Resting on its rim, the shell is stable and works as a hill or a shelter. Resting on its rounded base, it rocks and spins.
The design uses threefold symmetry, so two identical halves lock together into a sphere. The two openings read as eyes, which gives the object a face and a sense of direction. They also function as peepholes, anchor points for a pull rope, and spouts for pouring water.
Hochstrasser said every detail of the bilibo open-ended toy had to serve both the object’s character and its play value. He wanted a form that felt friendly and familiar but strange enough to spark curiosity.
The design drew attention well beyond the toy trade. It earned a Design Distinction in I.D. Magazine’s 2002 Annual Design Review, the same year the first Apple iPod received recognition in that competition. In 2012, Bilibo appeared in the MoMA exhibition Century of the Child: Growing by Design, 1900–2000. It has since entered the permanent collections of museums in Zurich, Brussels, and Paris.
Quarter-century play: a bilibo open-ended toy in new sizes
Bilibo Midi scales the concept down for younger children. It fits a 2- or 3-year-old, who can sit in it and spin. The smaller shell stays light enough to carry, even when it holds sand or water.
Hochstrasser said a modest change in size can alter how independently a child uses an object. During testing, toddlers picked up the Midi shells and used them as stepping stones without any help from adults.
Bilibo Dots arrives alongside the Midi. The set includes 36 counters, each with the original’s curved profile and two miniature eyes. Children can sort them, count them, thread them, or drop them into a classic Bilibo to make them rattle.
Hochstrasser describes all Moluk products as building blocks designed to work together. A new piece should expand what the others can do. He offers one example: a handful of Dots inside a Midi becomes a treasure chest.
Pieces that serve several play roles also show up in furniture, as seen in Multi-Functional Furniture Redefining Game Room Play, where one form shifts between uses.
The classic Bilibo will also appear in four special-edition colors for 2026 and 2027: amber, emerald, graphite, and coral. Apart from new colors, the original has kept its form for a quarter century. A 2021 retooling made it lighter and stronger. Children who grew up with Bilibo now watch their own kids discover it.
Hochstrasser credits the toy’s longevity to its simplicity. A bilibo open-ended toy has no batteries to replace, no screen to update, and no mechanism to fail. Its shape shifts depending on how a child holds or positions it. The object stays the same, but the play it allows changes as the child grows, and that is why Bilibo still feels new.
H/T design-milk.com
Frequently asked questions
Who designed the Bilibo open-ended toy and who makes it?
Swiss designer Alex Hochstrasser created the Bilibo shell. It is made by Zurich-based Moluk, which he runs with his sister Doris, an architect.
What can children use a Bilibo shell for?
According to the article, a Bilibo can serve as a seat, a boat, a helmet, or a drum. Its open-ended design lets children decide what it is.
What is Bilibo Midi and who is it designed for?
Bilibo Midi is a smaller shell designed for toddlers. It fits a 2- or 3-year-old, who can sit in it and spin, and it stays light enough to carry even when filled with sand or water.
Why has the Bilibo toy stayed popular for twenty-five years?
Hochstrasser credits its simplicity, since the toy has no batteries to replace, no screen to update, and no mechanism to fail. Its play value also changes as a child grows and handles it differently.
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