Just for visual effect in the doc.
kind used to construct an [Ulam Spiral](https://en.wikipedia.org/wiki/Ulam_spiral)).
For more information see [Square Spiral Example Joy Code](https://joypy.osdn.io/notebooks/Square_Spiral.html).
- square_spiral [_p] [_then] [_else] ifte
+ square_spiral [p] [then] [else] ifte
- _p [_p0] [_p1] and
- _p0 [abs] ii <=
- _p1 [<>] [pop !-] or
+ p [p0] [p1] and
+ p0 [abs] ii <=
+ p1 [<>] [pop !-] or
- _then [ !-] [[++]] [[--]] ifte dip
- _else [pop !-] [--] [++] ifte
+ then [ !-] [[++]] [[--]] ifte dip
+ else [pop !-] [--] [++] ifte
It might seem unreadable but with familiarity it becomes as legible as
any other notation.