Engineer Glen Dash says his team used a new measuring approach that involved finding any surviving remnants of the casing in order to determine where the original edge was.

If anyone were to remove the casing in a malicious attempt to remove components, the appliance is disabled and must be sent back to IBM to be reset before it can be used again.

Instead, it secretes a glue and USES this to stick bits of sand together to form its casing, in the way that a freshwater caddis fly larva does.