Here's conceptual way to make

spinner from Thursday. Start with this pentagon pattern below. This can be generated by the following polygonR&D code.

start {

scale 0.4

create pent

}

pent {

sides 5

ifon none {

paint green

sides 5

paint olive

create pent

3 right

create delay

} { }

}

delay {

create pent

}

The delay subprogram allows the pattern to development more symmetrically; without it, there would be a radial seam that would break the symmetry (C

_{5}). To add spice to the pattern alternating triangles can be inserted (the zig-zag construction described in

Zigzag Grid). To do this, the pent subprogram must be revised like so...

pent {

sides 3

ifon none{

paint olive

} { }

sides 5

ifon none {

paint green

sides 3

left

paint green

sides 5

paint olive

create pent

3 right

create delay

} { }

}

Finally, some extra triangles are added for decorations to get the original spinner pattern. The colouring of this pattern highlights the triangle- pentagon- triangle groups. It is interesting to see how the colouring has such a dramatic effect for each pattern. A seemingly simple change of switching the green and olive completely ruins the aesthetics of this pattern. The five pointed stars completely dominate instead of being a balanced part of the pattern.