What is in this image? Describe it as if you were explaining it to someone from the 15th century.

This image depicts a fantastical train drawn with a whimsical style, containing carts that bear no true weight or cargo. The foremost cart features what appears to be a mythical creature resembling an oversized chicken or bird, with expressive eyes and a crowned head. This entity rides enclosed within a cart that seems shaped reminiscent of a horse-drawn coach, yet markedly simplified and resting upon circular wheels that are common to all the segments of this procession.Following the leader are two more carts, each unique in structure but similarly fantastical. The middle cart houses merely air, yet it boasts circular windows reminiscent of those found on large seafaring vessels or the architectural flourishes of grand cathedrals, perhaps hinting at containing something unseen. The final cart at the rear echoes the form of a beehive or a knight''s helm designed for tournaments, split into various sections through linear accents.All three sections of this mysterious train are connected by simple lines, suggesting an invisible bond or perhaps a rope, which keeps them unified in their forward motion, floating above the simplified depiction of land, beneath a sky graced with but two clouds.In describing this to someone from the 15th century, one might say it is a tapestry or a drawn heraldic emblem displaying mythical creatures and fantastical chariots, journeying through an artist''s rendition of a landscape. It captures imagination and heraldry, akin to the mythical and allegorical stories popular in medieval art and literature.