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 .

Expanding Cube . . . expanded slightly

Expanding Cube . . .
single piece
( 1 of 6 )






Expanding Cube   . . . made by Skor-Mor from their Geo-Logic line - whose inner structure is taken from Stewart Coffin's design in his hardwood version by the same name !

Expanding Cube . . . plastic . . . expanded slightly

Expanding Cube . . . plastic . . . single piece
( 1 of 6 )

Lucky Star
. . . from Bits & Pieces online catalog .
An interlock coordinate-motion puzzle ( all the pieces move equally at the same time ) designed by Philippe Dubois who uses it as his logo.

Lucky Star . . . expanded slightly

Lucky Star . . . expanded more

Lucky Star . . . pieces









Pandora's Box   . . . from  Pentangle of England .
A high-quality coordinate-motion puzzle .

Pandora's Box. . . partially opened











Boomerang Burr . . . imploded
One of my creations .
Original burr is called  'Banana Burr' .   Interesting exercise in shape-changing 'explosion-type' coordinate motion,   utilizing 45° and 90° angles, with North American Eastern white pine, kiln-dried at about 8% humidity .
There were several areas on each of the pieces (not on any slide portion) I applied several coats of clear gloss polyurethane, just to enhance its aesthetics by way of contrast from other areas . . . such as the contrast between natural blonde-color to flame-torched areas .

. . . starting to expand . . .

. . . expanding more . . .









. . . fully expanded

Boomerang Burr . . . "UNVEILED"










Cerebral Rings

. . . from  Mag-Nif Inc.

Pieces















partial opening

piston