He often first made a rough design, after which he added accents with pencil and then filled in his works with waterproof ink. In addition to drawings, gouaches and watercolors, he also made several oil paintings. He combines his artistic mastery with an almost Cobra-like spontaneity. He had his own style in which the special atmosphere of the 1950s is recognizable. His work is in the Centraal Museum Utrecht and the Art Museum. A number of Hollaardt's drawings are also included in the National Collection.
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