Penrose diagrams in their original version are a coordinate system that has no fundamental differences, for example, from the traditional Cartesian coordinate system. The conformal tangential compression used in Penrose diagrams also has fundamental similarities, for example, with the logarithmic compression of Cartesian coordinates. However, some modifications of Penrose diagrams lead to the appearance of physically contradictory areas on them, for example, with time anisotropy, space discontinuities, and deformation of the coordinate grid. The Penrose diagrams in the original version are a coordinate system that has no funda-mental differences, for example, from the traditional Cartesian coordinate system. The conformal tangential compression used in the Penrose diagrams also has a fundamental similarity, for example, with logarithmic compression of the Cartesian coordinates. However, some modifications of the Penrose diagrams lead to the appearance of physically contradictory regions on them.