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

The image depicts a fanciful creature resembling a dragon, with a long neck and pleasant demeanor, clad in a sack-like garment with straps, possibly meant for protection or adornment. The creature stands atop a curious narrow board with four small wheels affixed to its underside. This board allows the creature to glide over the flat stones beneath it, seemingly in a playful or transportive pursuit. This setup, including the wheeled board (akin to small carriages without horses), might be hard to imagine without an understanding of modern playful inventions or vehicular devices.