This work is registered in the archives of the Calder Foundation, New York, under application number A18974.
'Spectacular as it is, there is no shortcuts, no tricks, no recipes, no mystification, in Calder's art. The only formula - probably the most sophisticated of all - is innocent simplicity.'
(J. Davidson, quoted in Calder, An Autobiography with Pictures, New York 1966. Reprinted with introduction by Jean Davidson, New York 1977, p. 7).