Michael Singer, a sculptor whose work blurred the lines separating art, landscaping, architecture and urban planning, died on March 14 at his home in Delray Beach FL. He was 78.

Mr. Singer was often characterized as a landscape architect with public commissions at sites around the country. But in fact, he was an artist who saw his medium and his ambition in expansive yet humble terms, with work that attempted to remediate humanity’s disruption of the natural world.

He spent 15 years in the forests of Vermont, “trying to figure out the human connection to the natural environment,” he told The New York Times in 2004. “How do we express it? How do we act in a way that isn’t controlling, destructive?” That connection was a concern for his entire career, even as he moved toward projects with multimillion-dollar budgets and five-year time frames. Such projects, he believed, demanded the insight of artists with, perhaps, unthought-of possibilities.