Kakoi
Shiro Tajima, 2016, Monarch Birch, Black Walnut and Japanese Cherry, 4” x 4” x 4”
Shiro Tajima was creating puzzle boxes with the Karakuri Group until a few years ago; his Hermit Crab and Goblet boxes are probably the most recognized of his boxes, as they have been produced in larger numbers. I reviewed his Uroboros box a few months ago (with one of the few solution vids I’ve done, as it was requested by a fellow puzzler). Kakoi is quite different, not only from Uroboros but from any box I’ve seen or done.
Kakoi consistently gets listed in community polls as being among puzzlers’ favorite boxes; in fact, it won the 2017 Nob Yoshigahara Puzzle Design Competition Jury Grand Prize, which is basically a long way of saying it’s a damn good puzzle. The only reason it likely doesn’t get an even better showing is simply due to its rarity.
It is a bit bigger than your typical Karakuri box and eschews the traditional panels for a look that is anything but traditional (or a panel). Your first impulse is pretty clear from looking at it and it does in fact lead to some success, or at least it seems to: this is one of those puzzles where movement early on doesn’t necessarily give you much info on how to proceed from there. While I have chosen not to post pics that display these early movements, a simple search will let you see some slight spoilers for said steps.
After futzing with it for a while, essentially just poking the same few things back and forth, I began to get a sense of what might be possible and started experimenting. This is one of those puzzles where things have to be juuuust right before you’re able to proceed, and it’s not so easy to see what that is until things are, in fact, just right, a tautological conundrum that helps to build the aha into something truly satisfactory.
One you find that perfect setting and the move it permits, the main movement is quite elegant and unique. Having accomplished this, it doesn’t take much to find the final steps, allowing you to access a total of four(!) hidden compartments.
Opening the compartments makes the puzzle impossible to close and it is pretty easy to get turned around such that knowing how to close it and actually doing so are not quite the same thing, at least for a few moments. This forces you to really look at how everything works together to first prevent and then permit the main movement. Once again you need to find the exact right arrangement before you can reverse the main step; when closing it you can really appreciate the close tolerances, a bit of a vacuum is even created, with the displaced air acting as excellent evidence of this precision.
Resetting the box is quite satisfying: enough so that Kakoi is among the puzzles that I have a tendency to re-solve most frequently. There is something about that main movement that I find to be so pleasant to do; the fine adjustments never seem to get easier, such that a moment of confusion feels inevitable with each run-through.
Shiro Tajima’s Kakoi is an excellent example of the uniqueness of Karakuri boxes; its aesthetic and movement stand apart from other boxes and offer an elegant and fun solution that relies on high levels of precision that others might sometimes struggle to obtain. If you happen to see this one available somewhere, I’d recommend considering it – it certainly sits comfortably amongst my favorite Karakuri.
Overall Grade: 5 Sinatras
(click here for more information on the Sinatra Scaling System, (c) John Maynard Keynes, 1944)
Puzzle Ramblings 
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