The Flickr Cityphotography Image Generatr

Streets of Tokyo by Bart van Lier Photography

B&W Photography

Streets of Tokyo by Bart van Lier Photography

B&W Photography

The Yellow Portal by Unknown-Photographer

A Mirror Image (in a plane mirror) is a reflected duplication of an object that appears almost identical, but is reversed in the direction perpendicular to the mirror surface. As an optical effect it results from reflection off from substances such as a mirror or water. It is also a concept in geometry and can be used as a conceptualization process for 3-D structures.

Two-dimensional mirror images can be seen in the reflections of mirrors or other reflecting surfaces, or on a printed surface seen inside-out. If we first look at an object that is effectively two-dimensional (such as the writing on a card) and then turn the card to face a mirror, the object turns through an angle of 180° and we see a left-right reversal in the mirror. In this example, it is the change in orientation rather than the mirror itself that causes the observed reversal.
Another example is when we stand with our backs to the mirror and face an object that's in front of the mirror. Then we compare the object with its reflection by turning ourselves 180°, towards the mirror. Again we perceive a left-right reversal due to a change in our orientation. So, in these examples the mirror does not actually cause the observed reversals.

Saint-Petersburg, formerly known as Petrograd and later Leningrad. It is situated on the River Neva, at the head of the Gulf of Finland on the Baltic Sea. The city had a population of 5,601,911 residents as of 2021, with more than 6.4 million people living in the metropolitan area. Saint-Petersburg is the fourth-most populous city in Europe, the most populous city on the Baltic Sea, and the world's northernmost city of more than 1 million residents.

The Historic Centre of Saint Petersburg and Related Groups of Monuments constitute a UNESCO World Heritage Site. Saint Petersburg is home to the Hermitage, one of the largest art museums in the world, the Lakhta Center, the tallest skyscraper in Europe, and was one of the host cities of the 2018 FIFA World Cup and the UEFA Euro 2020.

The name day of Peter I falls on 29 June, when the Orthodox Church observes the memory of apostles Peter and Paul. The consecration of the small wooden church in their names (its construction began at the same time as the citadel) made them the heavenly patrons of the Peter and Paul Fortress, while Saint Peter at the same time became the eponym of the whole city. When in June 1703 Peter the Great renamed the site after Saint Peter, he did not issue a naming act that established an official spelling; even in his own letters he used diverse spellings, such as Санктьпетерсьбурк (Sanktpetersburk), emulating German Sankt Petersburg, and Сантпитербурх (Santpiterburkh), emulating Dutch Sint-Pietersburgh, as Peter was multilingual and a Hollandophile. The name was later normalized and russified to Санкт-Петербург (Saint-Petersburg).

The historic architecture of Saint-Petersburg's city centre, mostly Baroque and Neoclassical buildings of the 18th and 19th centuries, has been largely preserved; although a number of buildings were demolished after the Bolsheviks' seizure of power, during the Siege of Leningrad and in recent years. The oldest of the remaining building is a wooden house built for Peter I in 1703 on the shore of the Neva near Trinity Square. Since 1991 the Historic Centre of Saint Petersburg and Related Groups of Monuments in Saint Petersburg and Leningrad Oblast have been listed by UNESCO as a World Heritage Site.