On July 25, 2013, the US Patent & Trademark Office published a patent application from Apple that reveals methods for forming three-dimensional structures which may be configured to provide desirable characteristics with respect to light, sound, and fluid travel therethrough. Further, the three-dimensional structures may be configured to define desired stiffness, weight, and/or flexibility within a device. The three-dimensional structures may be employed in embodiments including heat sinks, housings, speaker or vent covers, springs, etc. Apple's patent FIG. 5 noted in our cover graphic illustrates an example embodiment of a three-dimensional structure that includes connecting members defining a box structure. Hidden within Apple's patent is the fact that it relates to liquid metal applications.