| North America • Canada | William Notman commences his stereographic photographs of the city of Montreal. |
| Europe • Great Britain | John Benjamin Dancer applies for a patent for a stereoscopic camera (patent 2064, applied for: 1856-09-05, granted: 1857-02-27), allowing both images to be taken at the same time. Sets of stereographs quickly become popular. |
North America • USA
| Neff's Patent for Melainotype plates. (19 February 1856) |
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