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Description
String ball object 3D printed by Shapeways using Full Colour Sandstone (it's not actually sandstone; I think it's some kind of nylon derivative). The object was created using Functy and is a couple of parametric curves defined by the following formulae:

(x, y, z) = (40*cos(atan(2*sin(a*10*p)))*cos(2*a*p), 40*cos(atan(2*sin(a*10*p)))*sin(2*a*p), 40*sin(atan(2*sin(a*10*p)))),

radius = 3*((3+sin(4*(p+((1+sin(10*a*p))*8*p))))/4),

(r, g, b) = (1, ((1+sin(4*(p+((1+sin(10*a*p))*8*p))))/2)*0.6, ((1+sin(4*(p+((1+sin(10*a*p))*8*p))))/2)*0.4).

You can also see a 3D render that shows what the object might look like if it were made from glass.

Description
String ball object 3D printed by Shapeways using Full Colour Sandstone (it's not actually sandstone; I think it's some kind of nylon derivative). The object was created using Functy and is a couple of parametric curves defined by the following formulae:

(x, y, z) = (40*cos(atan(2*sin(a*10*p)))*cos(2*a*p), 40*cos(atan(2*sin(a*10*p)))*sin(2*a*p), 40*sin(atan(2*sin(a*10*p)))),

radius = 3*((3+sin(4*(p+((1+sin(10*a*p))*8*p))))/4),

(r, g, b) = (1, ((1+sin(4*(p+((1+sin(10*a*p))*8*p))))/2)*0.6, ((1+sin(4*(p+((1+sin(10*a*p))*8*p))))/2)*0.4).

You can also see a 3D render that shows what the object might look like if it were made from glass.