Plot

People arrive in a small village with a strange cat wearing glasses. When someone takes them off, he can color people, according to their nature and mood. Adults consider him dangerous; children love him.

Some people with a strange cat arrive in a small village. The cat wears glasses, and when someone takes them off, she can colour people, according to their nature and mood. The grown-ups of the village consider the cat to be dangerous, but the kids just love her...—Chris Makrozahopoulos <makzax@hotmail.com>

Castellan Oliva (Jan Werich) watches the everyday life of his small sweet town from the gallery of a tower. From that height, he can afford to keep a tolerant view of the weaknesses and frailties of his fellow-citizen. Robert (Vlastimil Brodský), a young teacher, is preparing to marry his colleague Julie (Jirina Bohdalová). Robert invites Oliva to sit as a model in a drawing lesson. The old man tells the children about his life as a sailor and about his first encounter with Diana, the love of his life, and her magical tom-cat. All of a sudden, jolly music sounds from the square, heralding the arrival of a strange circus. To the surprise of both children and adults, there is a magician sitting on the roof of a red car who is almost indiscernible from Oliva, and a beautiful girl named Diana (Emília Vásáryová) with a tom-cat wearing sunglasses on her lap. At the close of that evening's performance by the magician, Diana takes the sunglasses off her tom-cat and people begin to change colour in front of his green eyes. The unfaithful turn yellow, the liars violet, the thieves and highwaymen grey and those who are in love turn red.—NFA.cz

A small Czech town is turned upside down with the arrival of a magician, an acrobat and their magical, sunglasses-wearing cat Mogol. When the cat's sunglasses are removed, the true character and feelings of people are revealed. Lovers turn red, thieves turn gray, traitors turn yellow.—yusufpiskin

Robert is a school teacher in an undisclosed Bohemian village. He is under stress from Charlie, the foreboding town mayor who controls the happenings in town and from his unfaithful and uncaring lover. Robert teaches the children a 'black and white' view on life and a realist view on art, stifling imagination.

For an 'artistic' painting class, Oliva, a castellan (and storyteller) is invited as the subject. Instead of posing as a model, Oliva recounts a story of a cat with sunglasses - whose eyes revealed the true nature of the human condition through colour. Red, importantly, was the colour of 'lovers' - well-meaning people, whilst colours like yellow and purple were reserved for the unfaithful, envious and unruly. The 'normal' people eventually killed the cat, for they didn't want others to know who was good or bad.

In the midst of a circus act coming to town, Robert's cat goes missing and he is led to Diana - an actress who is part of the performance. He meets the MC who bears a striking resemblance to Oliva and talks to Robert about his 'nature' - joshing Robert about his choice of 'normal' clothes.

During the performance to the entire town, Oliva's tales of the cat come to fruition when the cat is revealed to everyone watching - and Diana takes off its sunglasses. The moment of everyone's colours being revealed drives the entire town insane, fighting over themselves. Robert, who's true nature is red, finds himself entranced with Diana - and the two embark on a romantic, idyllic outing.

Whilst the cat is later found by children in the woods, the school servant snatches it and attempts for it to be killed - orchestrated by Charlie. Robert is tasked to teach children about a taxidermized Stork in front of Charlie, but moved by the cat's power, gives a moving passage to the children that they shouldn't have to study the dead animal. This angers Charlie and the superiors in the town, who attempt to frame Robert for killing the cat.

At one point, the children go missing along with Robert, demanding they'll come back if the cat's safety is ensured. This sends the town amok, with families squabbling in the woods to find their lost loved ones. But, the children are no where to be found - not even Robert can find them, who tells them to come back. Eventually, the servant returns the cat and the children come out from hiding (with thanks to Oliva). When the crowd debates what to do with the cat, Diana and the circus act reappear to expose Charlie's true colors - a 'chameleon' of personalities, who is chased out of the town, reigniting the initial chaos in the town. When Robert tries to chase after Diana to accompany her, he is accosted by the frenzied crowd and loses her as the act travels out of town. Defeated, Robert walks alone back into the town square, only to be greeted by the children, who are holding art and paintings of the cat.