Most of the artist's work relied on his exceptional drawing skils, which provided the backbone to many architectural designs, frescos and plans for sculptures.
Michelangelo's drawing skills were also called on several times by inventors who needed to portray their ideas in as professional a way as possible, to help in getting investment to make each product come to fruition.
There are hundreds of study sketches remaining from preparatory work for all manner of projects, and the technical qualities found within them make them stunning artworks in their own right.
In recent years there has been a growing interest in the core technical skills of the Renaissance masters such as Michelangelo and Leonardo da Vinci, with frequent exhibitions concentrating solely on collections of their drawings from across their careers.
The beauty of these sketches is in the way that they highlight the fundamental, core skills possessed by the artists which may not be so obvious when paint, marble or other mediums are added later on as those projects develop.