My thoughts have returned to the unusual Prenzlauer Berg gravestone and I have decided to make a model.  The black outline will be cut from leftover acrylic plastic in the workshop and the design element (in red above) will be engraved (is engraved the right word – sounds quite grand -  anyway, it will be cut also but not all of the way through.)

Having already made an approximation of the spirograph design I have worked with Processing’s bezier() function to make an outline shape similar to that of the original stone.  It took some time to understand how to programme the curves but once the bezier principle is understood it is actually very simple.  Basically, the curve is constructed through combining both sets of co-ordinates for the construction lines (in red below).

Click for sketch and code.

PDF. here also. (any questions please add comment.)

(this instance of DIY gravestone manufacturing may or may not have been inspired by this Home Office video designed to help young people with everyday problems…)