Isaiah Zagar, an outsider artist who bedazzled thousands of square feet of Philadelphia with mosaic murals, pieced together from shards of mirrors and crockery and encrusted with bottles and bicycle wheels, died on Feb. 19 at his home in Philadelphia. He was 86.

From the late 1960s, Mr. Zagar produced more than 50,000 square feet of mosaic murals in Philadelphia and dozens of murals in other states and in Latin America. Some of his work is held in the permanent collections of the Philadelphia Museum of Art and the Pennsylvania Academy of Fine Arts.