Why did Wilson, the neighbor on Home Improvement never show his mouth for the entire series?
Wilson’s Face – Perhaps the show’s best-known gimmick. Since Wilson was partly inspired by a neighbor that Tim Allen had when he was very little and was too short to see over his neighbor’s fence (and therefore unable to see his neighbor), the bottom half of Wilson’s face was almost never seen on the show, unless he was playing another role. Instead, it was almost constantly hidden and sometimes blocked by various props, such as fences, grills, masks, plants, or scarfs. In one episode, Mark was papier-macheing his face leaving the bottom half of his face revealed. Also on one Halloween episode, Wilson was seen at a costume party dressed as the Phantom of the Opera, the mask covering the top half of his face and leaving his mouth revealed. On one occasion his entire face was visible, although hidden behind Halloween makeup.) On another occasion his face was covered with clown makeup. On yet another occasion his face was covered with a beard. His face was fully shown following the series