A married couple from Burgos travels to New York willing to spend a few days of leisure, culture and enjoyment. But from the first moment there is something that does not fit. What Alfredo and Teresa see on the street does not match the photos in their travel guide. It seems that they don't want to realize it, but the viewer notices that they are actually in a place that could be Madrid. However, the viewer may also be mistaken. An Optical Effect is a metafictional comedy about tourism, time and jet lag.