Jim Foster, a promotions manager with the National Football League, conceived of indoor football while watching <answer>an indoor soccer match</answer> at Madison Square Garden in 1981. While at the game, he wrote his idea on a 9x12 envelope, with sketches of the field and notes on gameplay. He presented the idea to a few friends at the NFL offices, where he received praise and encouragement for his concept. After solidifying the rules and a business plan, and supplemented with sketches by a professional artist, Foster presented his idea to various television networks. He reached an agreement with NBC for a "test game".
What was Jim Foster viewing when he came up with the idea for arena football?
an indoor soccer match