How did Paul Klee create his oil transfer paintings?

Paul Klee developed his distinctive oil transfer technique in 1919. These works, which are essentially coloured drawings, were created through a specific multi-step process:

• Tracing: Klee would first create a drawing, which he then traced onto a surface, typically watercolour paper.
• Transfer: To perform the transfer, he placed a sheet of paper coated with sticky black ink or paint between his original drawing and the final surface. As he traced the drawing, the pressure transferred the pigment onto the paper below.
• Finishing: Once the transfer was complete, he would add colour to the resulting image.

This method produced characteristically fuzzy, spreading lines that provided a unique, rich patina to his whimsical compositions.1