A Tetrahedron Split Four Ways: Inside the Craighill Tetra Puzzle

The Craighill Tetra Puzzle begins with a geometry question most puzzle makers never ask: can a tetrahedron, with four corners and four faces, split into four identical interlocking pieces?

Nate McCracken and Damein Williams at Revision thought it could. In January 2020 they sent a 3D-printed prototype to their former employer in Brooklyn. Kickstarter funded it at 2,193% of its $10,000 goal. MCA Chicago’s museum store stocks it now.

We scored it 8.4 overall, with WOW at 9 out of 10. This is the full research story.

Why WOW Scored 9

Our WOW dimension measures uniqueness and discovery factor. A 9 requires depth of story that cannot be easily found elsewhere. The Tetra hits that mark through three layers most desk puzzles never reach.

First, the mechanism. All four pieces must move simultaneously to assemble or disassemble the puzzle. Outside of Craighill’s own Venn Puzzle, we found no other commercial puzzle that requires this. The simultaneous movement of all four pieces remains the defining feature, and it is felt as much as seen. Every other metal desk puzzle we researched (Hanayama, wire disentanglement sets, burr puzzles) operates sequentially: remove one piece, then the next. The Tetra refuses that logic.

Second, the origin. The question behind the design is genuinely mathematical: if a tetrahedron has four corners and four faces, can it be broken into four identical pieces? McCracken was Craighill’s first employee. He left to co-found Revision with classmate Damein Williams. The prototype they sent back to their former boss became Craighill’s biggest crowdfunding campaign: 1,769 backers pledged $219,328 to bring it to production. Kickstarter tagged it as a “Project We Love.”

Third, the distribution channel. MCA Chicago’s museum store, which The Wall Street Journal named one of America’s best museum gift shops, carries it. So do Art of Play, Ugmonk, and Uncrate Supply. The Tetra is design-world known and mainstream invisible.

That gap is exactly what WOW measures.

What 57 Reviews Tell Us

We verified 44 reviews on Craighill’s site through Okendo (4.9 stars) and 13 on Amazon (4.3 stars). The sentiment clusters around three themes: quality and craftsmanship (8 mentions), unique design (6 mentions), and gift-worthiness (4 mentions).

One verified buyer on the brand site had already purchased the Amazon-available version and called the Craighill Tetra “in another category. Bigger, heavier, smooth and polished stainless, beautifully engineered.” An Amazon reviewer compared the assembled form to a prop from Dune.

The honest flag: solve difficulty is moderate. Most people complete it in under 10 minutes, per Amazon reviews. We flagged this in our evaluation. Reviewers frame it as a feature rather than a flaw, since the fidget cycle and desk-sculpture function outlast the initial puzzle challenge. An amateur puzzler on the brand site described the assembly feeling as “incredibly satisfying,” pointing to the tactile reward rather than difficulty as the value driver.

The Physical Facts

Four identical pieces of brushed stainless steel. 1.5 pounds total. 2.9 by 2.9 by 2.5 inches. That density, surgical-equipment weight in a palm-sized geometric form, is the first quality signal when you pick it up. The brushed finish is cool to the touch and smooth across all surfaces. Craighill also offers a Vapor Black PVD finish for those who prefer matte.

The Tetra carries Craighill’s For Life Guarantee: if it breaks, they fix it; if it fails, they replace it. Craighill is a design studio in Brooklyn, founded in 2015 by Hunter Craighill. The studio operates from the Greenpoint Manufacturing and Design Center, an 1868 Chelsea Fiber Mill that New York State sold for $1 to save from demolition.

The same studio produces the Desk Knife and Ripple Opener in brass, both designed with the same material-first philosophy.

Who We Matched It To

Our gift intelligence flagged the Tetra for people who have exhausted every obvious gift category. The product exists in channels most people never browse: Kickstarter to museum stores to indie design retailers. Someone who has already tried books, experiences, and gadgets will not have encountered it.

It also works when a gift needs to register without overstepping, the kind of situation that comes up with coworkers you respect but don’t know intimately. No logo, no taste alignment required, just geometry and steel. The MCA Chicago provenance provides institutional cover. At $98, it falls within appropriate range. The dual function (sculpture and puzzle) means actual desk use, not drawer storage.

For friends and siblings, the social catalyst function matters. The disassembled pieces circulate at gatherings. The solve takes about ten minutes, but passing it around occupies a room for an hour. Competitive siblings will time each other immediately.

Inside the Craighill Puzzle Family

The Tetra is not Craighill’s only puzzle, but it is the one we scored highest for desk presence. The Jack Puzzle in solid brass is a six-bar burr puzzle at $98, warmer in material but more conventional in mechanism. The Venn is a sphere with an aperture motion at $125.

The Tetra surpasses both as a sculptural object. The pyramid photographs like architecture. Pair it with Craighill’s Granule Hourglass and you have a desk where every object earns its square inch.

The Score Breakdown

GLOW scored 8. The brushed stainless steel pyramid form, clean geometric lines, photographs as abstract sculpture on any desk. The visual quality is strong but not the leading dimension. MOMENT scored 8. The weight in your palm and the counterintuitive simultaneous movement create genuine surprise, and friends demand a turn. TRUST scored 8. Forty-four verified Okendo reviews with customer photos and video, 13 Amazon reviews confirming quality and weight, 1,769 Kickstarter backers, and museum-store distribution across multiple retailers.

Designed by Revision for Craighill, Brooklyn, established 2015.

Final score: 8.4 out of 10. WOW carries the weight at 9, driven by the geometric origin, the simultaneous-movement mechanism, and a discovery pipeline that runs from Kickstarter to MCA Chicago without touching mainstream retail. The Tetra is not trying to compete with $15 Hanayama puzzles. It occupies a category that barely has a name: desk sculpture that happens to be a puzzle, backed by a math question that most designers would never think to ask.