After the Ganzes died (Victor in 1987 and Sally in 1997), their collection, including Le Rêve, was sold at Christie's auction house on November 11, 1997, as a means of settling their inheritance tax bill.
Efter att paret Ganzes dog (Victor 1987 och Sally 1997) såldes deras samling, inklusive Le Rêve, på auktionshuset Christie's den 11 november 1997, för att kunna göra upp deras arvsskatt.