Cuckoo Nest Another Stewart Coffin original made from six hexagonal birch bars with attached dowels, forming a symmetrical cluster . A higher-level version is called Locked Nest (aka The Monster), with twelve bars instead of six .
Expanding Cube . . . Stewart Coffin's creation . It was the first copy made . By sheer gravity design, after initial connection, all the pieces close in towards the center . One only needs to grasp the puzzle by two of its pieces to start all of them expanding until total disengagement is reached, thus making it a true coordinate-motion puzzle .
3pc Block . . . from Stewart Coffin . I have designed several styles from this original . . . here
A shape-changing puzzle from Stewart Coffin . Six interlocking, dissimilar pieces of Honduras Mahogany which assemble different ways to form various geometrical figures having an axis of symmetry . The assembled puzzle has the shape of a symmetrical column with the Star of David as cross-sectional end faces .
Different assembly combinations yield the different shapes .
You can view the solution here
PinHole . . . from Stewart Coffin . So called because the locking mechanism are wooden dowels that set into their complimentary holes .
Snowflake . . . from Stewart Coffin Made from Hydrastone - a combination of US Gypsum "industrial strength" Portland cement and plaster . Two-Dimensional combinatorial hexagon puzzle .
Cube . . . from Stewart Coffin . Pentangle's version is called 'Wookey Hole' . Made of Cherry, Mahogany, Maple, Rosewood & Padauk .