# Napkin

**URL:** <https://forum.kirupa.com/t/napkin/245025>\
**Category:** open source\
**Created:** [November 25, 2007, 1:56pm UTC](https://forum.kirupa.com/t/napkin/245025 "2007-11-25T13:56:56Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![antongranik](https://avatars.discourse-cdn.com/v4/letter/a/ac91a4/32.png) [@antongranik](https://forum.kirupa.com/u/antongranik)\
**Post date:** [November 25, 2007, 1:56pm UTC](https://forum.kirupa.com/t/napkin/245025/1 "2007-11-25T13:56:56Z")

</div>

![](http://forum.kirupa.com/uploads/kirupa/4146/e14fda965f21b33f.gif)

These beautiful napkins are drawn by a very simple formula:

_**x = y - sign (x) \* sqrt ( abs ( B \* x - C ))**_  
_ **y = A - х** _

View them being drawing [here (press the spacebar there to regenerate with the new random constants a, b and c). Download the source here ([URL=“http://granik.com/flashexp/napkin\_bmp.fla”]Flash 8). View some interesting iterations [URL=“http://antongranik.livejournal.com/15502.html”]here](http://granik.com/flashexp/napkin_bmp.html) (LJ).