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

What you see in the image is a fantastical creation, akin to a chariot of the heavens, but crafted of materials you might not fully comprehend as being possible. Picture a sailing vessel designed not for the seas but for the air itself, sleek and elongated with no oars or sails but equipped instead with great fins and a pointed front. This vessel is poised as though flying above the land, swiftly gliding through the sky with ease, defying the hold of earth with a sorcerous buoyancy. It is a sight of marvel, suggesting the art of flight not with feathers and wings like those of birds but through some unseen, mystical means of propulsion hidden within its smooth, rounded body.