A vector of 10 integers is used as a simple and compact
encoding of the x-y-axis of a prototype VAWT. Each allele thus
controls 1/10th of a single z-layer. A workspace (maximum
object size) of 30×30×30 mm is used so that the instantiated
prototype is small enough for timely production (∼ 30 min)
and with low material cost, yet large enough to be sufficient
for fitness evaluation. The workspace has a resolution of 100×
100 × 100 voxels. A central platform is constructed for each
individual to enable the object to be placed on to the evaluation
equipment. The platform consists of a square torus, 1 voxel
in width and with a center of 14 × 14 empty voxels that are
duplicated for each z layer, thus creating a hollow tube that is
3 mm in diameter