Once again this a great poster for a short film that is now long forgotten. Debemos Saber (We Should Know in English) is a 15 minute documentary by Cuban director Ramos. And that's all I can find out about it. This is a shame as the image of the eerie face has a mysterious look, making the film look very interesting. Again, this is typical Reboiro making use of complex detailed black and white technical illustration and adding a colourful Cuban twist.