"There's an ecstasy about doing something really good on film: the composition of a shot, the drama within the shot, the texture... It's palpable"

William Shatner is describing the happiness and complete satisfaction of producing something unique on movie. He is emphasizing the value of the composition of a shot, the drama within the shot, and the texture. He is recommending that when these aspects come together, it develops a palpable feeling of euphoria. This sensation is something that can just be experienced by those who have worked on a film and understand the effort and devotion that goes into producing something special. It is a feeling of accomplishment and pride that comes from developing something that will be remembered and enjoyed by others. William Shatner is expressing his gratitude for the art of filmmaking and the joy that comes from developing something lovely.