Stereogram uses Google Cardboard to present vivid 3D images from history. Powered by the NYPL Stereogranimator (http://stereo.nypl.org), Stereogram allows you to: -Search over 40,000 historical stereographs by voice -Browse popular images from Stereogranimator. -Curate your own list of favorite stereographs. -View 3D images of your own Stereogram requires a special housing for your smartphone, made to the "Google Cardboard" spec: http://cardboard.google.com , such as the DODOcase. Other 3D/VR viewers such as the Durovis Dive, etc may be supported. The Nexus 5 is the ideal phone for this app, or any 1080p smartphone that is compatible with Google Cardboard. The experience with other handsets may vary. If you got a chance to try this app, please leave a review with your thoughts!