Marcel Duchamp on Takis

Some time ago, the famous Dadaist/surrealist artist Marcel Duchamp wrote a note of admiration on the work of Takis, pointing out, in particular, his oeuvre on magnetic fields:

Of course, he is not referring to me, but to Takis, the artist  whose work can be seen in La Défense, Paris. He  used magnetism as a tool for his installations. I remember some of that from the Berkeley Art Museum. I also remember a stamp, issued by France in 1993, exhibiting a ... rather abstract work by Takis. I used to own the stamp.