Wikipedia Talk:Aperiodic tiling Help rewrite I fully understand the difference between nonperiodic and aperiodic. I failed to make it clear that it the first clause of that sentence that is redundant. A non-redundant form of that statement would be "In geometry, an aperiodic tiling is a tiling by a finite set of prototiles that do not admit any periodic tiling.". It is redundant to say that the tiling is nonperiodic, because that is immediate from the statement that its prototiles can only tile nonperiodically. Incidentally, I consider the rewording "... that does not repeat itself..." to be an unhelpful dumbing-down of "nonperiodic". -Dan Hoey 12:26, 24 April 2007 (UTC)