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

In the drawing, there appears to be a scene with a stout man engaged in mending a large, peculiar object. This object is round, much like a giant metal hat or a flattened cooking pot with a see-through lid on top. It has numerous small windows and rests upon three legs. This might be akin to a whimsical idea of a vehicle that flies through the heavens, much like a chariot but without horses and apparently capable of floating in the air or even traversing the celestial realm. The man, who looks cheerful and busy, is holding tubes, which he seems to be connecting or fixing with tools typically used by a blacksmith or a barrels cooper.The surroundings are stark, resembling a fortress wall with fractures, suggesting either an open countryside or perhaps a space beyond the common earth, filled with ether and mystery. The man wears a leather apron and a cap, common to a laborer or craftsman of your time, and seems to be going about his craft with both precision and delight. His presence implies that the floating metal vessel might require maintenance or refueling, much like a mill needs water or a cart needs its wheels oiled. A picnic basket nearby suggests he''s prepared for a long stay at his task. This image blends the familiar with the realms of wild fancy and could be told as a story of a clever artisan who fixes the fantastical carts of the sky travelers.