A team of optical engineers at the the University of Connecticut has developed a way to securely display 3D images by scanning a QR code. The QR codes store compressed, encrypted images that can be scanned, decrypted and decompressed by commercial smartphones. Smartphones do not require an internet connection to receive the images, although a special array of ‘lenslets’ (tiny lenses) needs to be placed over the screen to view the 3D image. It is thought that the way of creating and storing images in the QR codes could be a ‘highly secure’ method of data transfer. The work was published at http://tinyurl.com/nds2kjh.