The bronze sculpture Copper head by John Rädecker is placed at De Kolk, a fen on the edge of the current sculpture garden. On 8 February 1924, Helene writes to Sam van Deventer about the placement of John Rädecker’s sculpture. ‘Yesterday the very first visit: the Prof […] they kept drinking coffee, it was enjoyable. I went with them to the construction site for a while, to the old pines in order to determine the position for Rädecker’s head, for which a pedestal has been made. It will look beautiful there’.