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Miloslav Ciz 2023-07-09 11:51:15 +02:00
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@ -48,7 +48,7 @@ Tangram usually comes as a box with the 7 pieces and a number of cards with shap
{ I found tangram to be a nice practice for **letting go of ideas** -- sometimes you've got an almost complete solution that looks just beautiful, it looks like THE only one that just has to be it, but you can't quite fir the last pieces. I learned that many times I just have to let go of it, destroy it and start over, usually there is a different, even more beautiful solution. This experience may carry over to practical life, e.g. [programming](programming.md). ~drummyfish }
**Can tangram shapes be [copyrighted](copyright.md)?** As always nothing is 100% clear in law, but it seems many tangram shapes are so simple to not pass the threshold of originality for copyright. Furthermore tangram is old and many shapes have been published centuries ago, making them public domain, i.e. if you find some old, [public domain](public_domain.md) book (e.g. the book *The Fashionable Chinese Puzzle*) with the shape you want to use, you're most definitely safe to use it. HOWEVER watch out, a collection of shapes, their ordering and/or shapes including combinations of colors etc. may be considered non-trivial enough to spawn copyright (just as collections of colors may be copyrightable despite individual colors not being copyrightable), so do NOT copy whole shape collections.
**Can tangram shapes be [copyrighted](copyright.md)?** As always nothing is 100% clear in law, but it seems many tangram shapes are so simple to not pass the threshold of originality for copyright. Furthermore tangram is old and many shapes have been published centuries ago, making them public domain, i.e. if you find some old, [public domain](public_domain.md) book (e.g. the book *The Fashionable Chinese Puzzle*, *Amusement in Mathematics* or *Ch'i ch'iao hsin p'u: ch'i chiao t'u chieh*) with the shape you want to use, you're most definitely safe to use it. HOWEVER watch out, a collection of shapes, their ordering and/or shapes including combinations of colors etc. may be considered non-trivial enough to spawn copyright (just as collections of colors may be copyrightable despite individual colors not being copyrightable), so do NOT copy whole shape collections.
**Tangram [paradoxes](paradox.md)** are an [interesting](interesting.md) discovery of this game -- a paradox is a shape that looks like another shape with added or substracted piece(s), despite both being composed of the same pieces. Of course geometrically this isn't possible, the missing/extra area is always compensated somewhere, but to a human eye this may be hard to spot (see also [infinite chocolate](infinite_chocolate.md)). New players get confused when they encounter a paradox for the first time, they think they solved the problem but are missing a piece, or have an extra one, while in fact they just made a wrong shape. TODO: example