Crooked Wallpaper

	    Robert J. MacG. Dawson

Abstract
     A well-known tiling of the plane with rectangles is used as the
basis of a protocol to store and transmit periodic bitmaps whose period
vectors are not aligned with the screen raster axes. Some related
results are presented, including an algorithm to find all choices  for
the dimensions of the rectangles. 

Keywords: periodic tiling, rectangle, wallpaper, bitmap,
parallellogram, Euclid's algorithm

AMS subject classification: 52C05