Public art often sparks debate, but some sculptures never make it past the planning stage due to their controversial nature. Here are some of the most contentious outdoor sculptures that were ultimately rejected or abandoned:

1. "Tilted Arc" by Richard Serra – Though installed temporarily in New York, its removal was highly controversial. Similar proposals elsewhere faced outright rejection for their obstructive designs.

2. "The Cloud" by Anish Kapoor – Planned for London, this towering structure was scrapped over concerns about its visual impact and cost.

3. "The Vessel" (Revised Design) – After safety concerns led to closures, proposed redesigns were shelved due to public backlash.

4. "The Wall" by Christo and Jeanne-Claude – A proposed 12-mile fabric wall in Colorado was blocked over environmental and aesthetic objections.

5. "The Pyramid of Detroit" – A dystopian pyramid-shaped slum concept was deemed too provocative for public funding.

These projects highlight how public art can push boundaries—sometimes too far for approval. Controversy often stems from cost, aesthetics, or social implications, leaving these sculptures as unrealized visions.