The effect of optical illusions in architectural urban development can not be found very often. Such houses of non-traditional layout immediately become famous city attractions. This is, for example, the Odessa “house with one wall”, or “The Witch House”, which, when viewed from a certain point, looks like one facade. But Moscow also has “flat” houses, and not one, but two. Unique buildings are located on Presnensky Val and Malaya Gruzinskaya.

The secret of the first house is simple: one of its corners is sharp, so if you look at the building from a certain side, it resembles a flat “cardboard” with window frames and balconies protruding from it. To solve the mystery of the optical illusion, you need to go around the house in a circle. On the opposite side of the acute angle, it has a completely traditional shape. The second house is decorated differently: one of its end sides is crowned with a narrow ledge, and when viewed from the right side, the house looks as if its entire back is cut off by a fantastic giant cutter. In fact, a little further than the ledge, the structure acquires a standard shape and proportions, but the decorative ledge does not allow this to be noticed. When viewed from the facade, both houses look quite traditional, so those who do not know what to look at will not immediately guess that “something is wrong” with these buildings.

Unlike the Witch House, which is a famous landmark of Odessa, Moscow's “flat houses” are not known to anyone, except for residents of the district, and crowds of tourists are not attracted - although, certainly deserve much more popularity.