The main subject of this epic poem was love in itself, but it is clear that it was treated under the passion that moved Mayakovsky toward Lylia. After a brief separation, in a Christmas time before 1922, Mayakovsky wrote a kind of proto-surrealist poem in which he alegorizes the feeling of missing Lylia. Some parts reflect themes akin to what Angelo Maria Ripellino once called the "revolt of the objects". In a telphone conversation, for example, the poet sees himself as a dinossaur that crawls through the line, whereas the entire house shakes as the phone bell rings.
Considered as one of Mayakovsky's masterworks, "Pro Eto" has also his logo-poem, kind of a ring designed by the design pioneer El Lisitsky. Some authors tend to consider that the passion to Lylia was one of the motives that had driven Mayakovsky to suicide in 1930. Although married with Ossip Brik, Lylia never separated from him, but had grown old affirming that the rumours of a "ménage" between her and Mayakovsky and Ossip were entirely false.
She died in the seventies in Russia, never left the country.