By far the hard part of putting together a show like this, in
strictly physical terms is the field engineering. In this phase lots of
physical labor is combined with the use of heavy machinery to set the
stage for the carving crew to come in and work their magic. First, a water
source is established and then the forms are delivered. There were over
350 individual pieces of forms used to create the solid base blocks of
densely packed sand from which the artist would eventually render the
sculptures.
A pound up is the term used for a single compressed block of
sand from which a sculpture is carved. it can be any size and shape. In
this show, some were as large as 300 tons, others as small as two tons.
Here is an example of a finished pound-up, built to spec.
Here is what the sculpture rendered from the same pound-up looks
like
A pound up is created by first configuring the forms into the
desired shape. The wooden forms pieces used here are all one half meter
tall, and vary in lengths from one meter to three meters long. Each piece
is designed to work with other pieces as an "inside" (male) form
or an "Outside" (female) form. This refers to the type of ends
the form has with the stringer boards either being on the outside edge of
the wood planking (female or 'outtie'), or stepped-in from the edge of the
planking to interlock with the females, are the male forms (innies) see
the photo below for an example.
The pieces are joined by nailing them together in such
a way that the nails can later be easily removed to dismantle the forms
after the sand has been compacted revealing a solid dense block of hard
packed sand.
The forms can be assembled in a variety of shapes and
sizes, and are stacked one on top of another as they are each filled with
alternating layers of sand, mixed with water and then compacted.

Here are some of the finished pound-ups, ready to be
carved.

Finished Sphinx pound-ups before carving...
...And after