Math, symmetry are in nature. The snowflake is symmetrical and playful it permit to teach a child the symmetry.
A snowflake pattern is a clean application to a tessellation.
The snowflake, or rather the water which is the essential component of it, is the element that makes the cohesion of a sand castle.
This mold contrast to the summer temperatures, it is a wink to the past winter. Through this mold, we think to we rehydrate, and why not, eat an ice cream.

The sand flake castle is easily manageable by a child. The structure of flake was strengthened, so that the sand castle does not collapse during the demold step. The design is also thought to be a futuristic fortified castle with its ramparts, its central tower, its door and its defense towers.

The material called "frosted ultra detail plastic" was chosen to see if the mold is filled, and to resemble look like a snowflake.

The material instruction are there:
http://www.shapeways.com/materials/frosted-detail-plastic

The mold max bounding box is L 24 x D 21 x H 12.
The wall thickness is around 0.2 mm.