On May 24, 2012, the US Patent & Trademark Office published two major patent applications from Apple relating to a future iPen. In our first report published this morning titled "Apple Sheds More Light on their iPen & Graphics Program," we covered Apple's push into specialized haptics for a future iPen. In our second report, we focus on Apple's consideration of using an optical based iPen. The unique angle taken by Apple's optical pen is a fascinating approach to determine a pen's location on a tablet surface. One of the secrets utilized in this approach uses invisible indicia.