A floating sculpture made of 7,506 oil barrels in the middle of The Serpentine lake in Hyde Park. For almost 50 years, the artist duo and couple Christo and Jeanne-Claude have collaborated on temporary, grand-scale installations all over the world. Though Jeanne-Claude passed away, Christo continues to construct pieces they had planned together. Conceived in 1977 and completed in 2018, it is actually a test run for a larger, permanent mastaba planned in the United Arab Emirates.