A celebration of the unique silhouettes of the natural world, bold desk by Caleb Zipperer is inspired by the gently curved shape of woolly mammoth tusks. andamp;quot;I often like to think about different periods in Earth's history to see where I can conjure up unique shapes. For the Tuske desk, I was drawn to the megafauna of the Cenozoic Era,andamp;quot; explains the designer. The desk is crafted of Indonesian sungkai wood for a rich grain pattern that makes each naturally one of a kind…