Zentrum Paul Klee Bern Founded by Maurice E. and Martha Müller and the heirs of Paul Klee

​Portrait of an emotional lady, 1906

In the summer of 1905, Klee started using a new medium: blackened sheets of glass, which he worked on with a needle.

Using the resistance of this unusual medium, he discovered a new form of artistic expression - the scratched drawing. In his diary, he described his discovery thus: «The medium is no longer the black line, it is the white. The light energy on a midnight background fits very well with the expression 'let there be light'. And so I glide gently over into the new world of tonalities.»