 While precinct boundaries may be difficult to physically distinguish in older precincts, they are usually obvious in newer precincts through the physical layout of the block and their unique architectural design.Newer precincts (and upgraded older precincts) also often adopt fanciful names reminiscent of private developments to lend an air of class and belonging, although these names are often not used in reality since they are sometimes not displayed and are not part of official addresses.Public housing precincts in Singapore are clusters of public housing blocks arranged as a single unit.