 Even at the height of the Jugendstil style, there were opponents who criticised the stagnant tastes and mythological approaches whereby Jugendstil was becoming institutionalised.The most well-known opponents were architect-critics Sigurd Frosterus and Gustaf Strengel.Frosterus had worked briefly in the office of Belgian-born architect Henry van de Velde in Weimar in 1903, and at the same time Strengel worked in London at the office of architect Charles Harrison Townsend.