iPad Screen Close Up (image) University of California - San Diego Share Print E-Mail Caption Researchers spent a lot of time developing a sketching feature for the app, which allows users to draw 3-D shapes on a 2-D grid. "The physical act of sketching is important for learning spatial visualization," Delson explained. Credit Jacobs School of Engineering/UC San Diego Usage Restrictions Please credit Jacobs School of Engineering/UC San Diego 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.