Description:

In an old attic, Bear and Hedgehog discover a picture of the sky. Unfolding it, they find themselves in a hot summer, then in a rainy autumn, then in a frosty winter, and in the mix they meet the characters of various fairy tales. A dreamy and phantasmagorical story about the search for harmony, adapted from the story by Sergey Kozlov.

This was the directorial debut of Natalya Marchenkova, who'd been working as an animator for 20 years already by this point, often in the films of her husband, director David Cherkasskiy.

The original story can be read here (3rd story), although the film departs from it significantly. There are many cameo appearances from East Slavic folk tales as well as other stories that were well-known to Soviet children at the time.

For example (characters in square brackets still need to be identified):

2:53 - [man carrying heavy chest through desert, brigands on flying carpet following him]
2:59 - Alyonushka and her brother Ivanushka (who turns into a little goat after drinking from a puddle formed by a goat hoof-print)
3:19 - the genie of the magic lamp
3:51 - the frog traveler from the 1887 story by V.M. Garshin
3:58 - Baba Yaga's hut on chicken legs
4:08 - Baba Yaga
4:14, 5:39 - Doctor Aybolit (a Soviet character featured in poems, books and cartoons inspired by Dr. Doolittle)
4:39 - Father Frost / King Winter / Santa Claus
4:55 - [the Snow Queen?]
5:03 - [the (personification of the) New Year? e.g. like in this 1945 cartoon]
5:06 - the wolf trying to fish with his tail (from "The Wolf and the Fox")
5:14 - Zmey Gorynych (the three-headed dragon)
5:51 - Grandpa Mazay and his hares (from A. Nekrasov's 1881 poem)
5:54 - Three wise men of Gotham - from the short English folk poem well-known in Russian thanks to Samuil Marshak's translation
6:00 - Tsar Saltan and his mother, from Pushkin's famous verse novel
6:15 - Thumbelina and the little bird who saves her
6:43 - the Pied Piper of Hamelin and his rats

The Russian and Ukrainian-language versions of the film were made at the same time. The first video above is the Ukrainian-language version (which has been restored and has a nicer image), while the second one is the Russian-language version. The restoration was done by the laboratory of the Oleksandr Dovzhenko National Center in 2021-2022 from 35mm film material preserved in its collection (source).