GALLERY OF DESIGNS — click a thumbnail for a larger version    Streets
	Since high school, for my own amusement I've drawn pencil sketches of plans, playing with the challenge of working out the geometry.  Here is one category:  streets for imaginary cities. Having grown up on the plains of central Ohio, I tend to imagine cities without hills, rivers, or other obstructions that would distort my regular geometry.  Except for one town that surrounds a round lake, all of these plans assume a large expanse of flat, empty land. In a simple street grid, north-south streets and east-west streets cross each other at regular intervals, and all of them are of equal rank.  But it usually helps to design a hierarchy in which some streets are "higher" than others.  The "high streets" may be wider and carry more traffic at faster speeds.  The other streets may be more numerous and be lined with individual houses and other destinations. For example, in Manhattan, the north-south avenues take priority over the east-west streets.  The name of each consists of two words, like "Madison Avenue" or "Thirtieth Street." Here's another scheme that I dreamed up.  To obtain the first word of thoroughfare names, for east-west I chose colors in alphabetical order, and for north-south I chose animals (Armadillo, Beaver, Cougar, Deer...).  To obtain the second word, I defined these priorities: Alley Avenue Boulevard Lane Mainline Place Street Way One-eighth of the thoroughfares are of the lowest rank and are colored yellow (Alley).  Half are of ordinary rank and are colored pink (Avenue, Lane, Place, Way).  A quarter are of higher rank and are colored turquoise (Boulevard, Street).  And an eighth are of the highest rank and are colored green (Mainline). (TEXT CONTINUED BELOW) Where two non-yellow streets of equal rank cross each other, the intersection is enlarged to make a square.  The larger the square, the more public the structures that front on it. The largest square, of course, is where two green streets cross.  For example, the intersection of Red Mainline and Deer Mainline is called Red Deer Square and is bounded by eight monumental buildings, indicated by crosshatching. Each such green square has four turquoise squares nearby.  For example, one of them is at the intersection of Red Boulevard and Deer Boulevard; it's called Red Deer Northwest and is lined with retail stores.  The next turquoise square to the east would be at the intersection of Red Boulevard and Deer Street (not shown) and would be called Red Deer Northeast. Finally, each turquoise square is surrounded by four small pink squares.