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

This image depicts a fantastical flying contraption, somewhat akin to the mythical chariots that soar through the skies in ancient tales. Picture a large, stout vessel, curiously round and robust with a flattened bottom, likely to hold its crew securely. It has rotund structures that look like giant waterwheels affixed on the sides and front, but instead of touching water, these wheels brandish blades that slice through the air, proposing that they somehow enable the vessel to lift off the ground and navigate the heavens.Atop the contraption sits a large wing-like structure, reminiscent of a bird''s outstretched wings, perhaps there to catch the wind. The contraption is adorned with bands and ropes crisscrossing its body, giving it a secured and fastened look, as if bracing for vigorous winds aloft. A prominent fixture on the side is marked with the number "1", suggesting it is perhaps the first of its kind or holds a place of importance.To someone from the 15th century, this might be described as a fantastical carriage designed not for the roads but for the skies, akin to the flying devices imagined by the ingenious Leonardo da Vinci, who in your time sketches contrivances that he believes might one day conquer the air. This vessel, undoubtedly driven by some enigmatic force, would seem to unite the art of carpentry with the mysterious principles of flight—a true curiosity of ingenuity and imagination.