The story centres on the appearance and evolution of a 'wall' which has appeared, and which appears to possess a considerable electrostatic potency. The film explores the efforts to understand this phenomenon, the discussions between the scientists at the research station adjacent to the 'wall', and how they interpret the 'visions' and hallucinations which it appears to engender.
I really enjoyed the debates among the scientists concerning the wall's properties and its meaning and significance, with some seeing it as a message from extra-terrestrial beings, and others suggesting alternative explanations.
As is generally the case when viewing Soviet science fiction, there is a temptation, understandable perhaps, to read some overt ideological or political meaning into every image, or every snippet of dialogue, and it is important not to allow this compulsion to hinder one's enjoyment of the films for their own sakes.
Having stated the above, it is intriguing to note that a film focusing on a 'wall' was made in the Eastern bloc during the 1960s. Presumably the powers-that-be thought that the movie's overall philosophical orientation outweighed the importance of any perceived critique of 'walls' as a concept.
More broadly 'The Mysterious Wall' appears to concern itself with questions of the possibility of there being intelligent extra-terrestrial life, and what the effects and implications of discovering such life would be. Also, I sensed that the the makers were posing questions about possible centralized attempts to control the scientific agenda and keep 'mavericks' under control, and about the attendant struggles between various factions within the system.
One interesting question which appeared to me due to this picture was whether the Soviet authorities would have found the appearance of alien beings desirable, and how it would have fitted into their worldview, and their sense of their own primacy or supremacy.
I liked the film, all in all, as it has a pleasingly organic flavour, and it is not marred by a compulsion to 'do special effects'. The plot and the atmosphere are enough. There is an interesting insinuation, to begin with, that the scientists already 'in situ' at the research base adopt a 'space station mentality', evincing a separateness. I would have liked this element of the plot to be developed more fully. The hallucination or 'dream' sequences are nicely done, and are arguably more polished than the rest of the film.
So, this is not a startlingly original film, and the subjects which it explores are by and large standard science fiction fare, but the dialogue comes across as sincere, rather than corny or patronising.
A well made and interesting science fiction movie.