Strongly recommended. Tarkovsky initial work showing multiple glimpses of his genius. This short film has great depth and detail. Personally it is was the only Tarkovsky film that I had not seen, and now that I have I rate it very highly. In retrospect to his ouvre it may be strong to use the term "masterpiece", but regardless it is so. It is also probably the most accessible for viewers not familiar with his work and could prove as a perfect introduction. I urge you to see it.
