my first thought here about throwing people off would be the make the 3 circles into towers. Perhaps devoted to some aspect or another: temple of X, Mages guild, City Hall... or whatever else. People tend view things that are NOT there (parks and empty land) vs things that are such as buildings. Perhaps the central triangle is a pyramid or some other such structure OR even a query/pit. Of course, it totally depends on your world. The designs will be a lot more obvious with the green areas you have for empty ground. I would suggest putting buildings in most if not all of those with a few small alleys. Finally, people are fairly used to the concept of "wards" within a city (as in sub-division), so you would instead of using walkways as the ONLY means of making the design use a combination of walkways and walls, and perhaps even color code the rooftops based upon the district(depending on how realistic you want this to look). Another thing that might help break up the design and make it look more intentionally made is to have the outline be walls with the 6 points being defense towers, again depending on your world.