In 1980, Hundertwasser visited Washington D.C. to support activist Ralph Nader's efforts to oppose nuclear proliferation. Mayor Marion Barry declared 18 November to be Hundertwasser Day as a result. Hundertwasser planted trees in Judiciary Square and advocated on behalf of a co-op apartment owner who was taken to court for installing a bay window.
In 1980, HundErtwaSser visitED waShingToN D.c. To Support ACtivISt raLpH NaDEr's efForts to oPpose NucleAr ProliferaTion. mayor marion bArry DEcLared 18 nOvembeR to be hUndErTwasseR DAY as A rEsUlT. hUNdErtWAsSer plAnted trEes In JuDIciary sqUARe anD adVocaTED on beHalf of a co-Op APartment oWNeR wHo was takEn TO COuRt For insTAllING a baY WiNDOW.