Unfolding animation (video) Queen Mary University of London Share Print E-Mail Loading video... Caption Computer-generated unfolding animation of sealed letter DB-1538. In our paper we describe how "virtual unfolding" was used to read the contents of sealed letterpackets from 17th-century Europe without physically opening them. Credit Courtesy of the Unlocking History Research Group archive. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.