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

This image portrays a fantastical carriage that skims on the water, unlike any boat seen in your time. It has large, flat boards resembling wings attached to its sides and a circular contraption at the front, reminiscent of a mill’s wheel, which might suggest how it propels itself through or even above water. The carriage is mounted on curved runners, akin to the hull of a light boat. Perched atop this miraculous vessel is a bird, and another sits upon a wooden post protruding from the water nearby, perhaps surprised or curious about the marvel before them.