6 .136 the total section is required. Table 6.19 lists several options for site coverage and floor-area ratio. Option one relies heavily on vertical development, option three requires primarily horizontal spaces, and option two a mix of both "high-rise" and "low-rise" types. Option two seems the best suited for our development; therefore a mixed-scale plan is elaborated. Table 6.20 groups pieces of the proposed Habitable Space Program into a scheme for deployment into the landuse plan. Groupings are hierarchical, proceeding from largest-scale to smallest-scale organizing features. Within each neighborhood, dominant public spaces (streets, plazas) ar~ listed and their abutting facilities named. From dominant spaces to secondary circulation paths and finally local passages, activities would be placed to reinforce and define the nature of their service arteries. Housing clusters would be dispersed to the neighborhoods. Density would vary within neighborhoods; in addition, an amount of site area would be left unplanned and unused to accommodate changes in attitude, increase in colony size, and needed facilities unforeseen at present. Figure 6.42 presents the Landuse Plan. The Colony is pictured "unrolled" in order to show in plan all facilities at once. Since the edges of the plan touch, it is important to imagine the continuity of the neighborhoods among themselves. The plan presented is not an immutable document, neither is it the "one true plan" possible for the prototype colony. Its specific decisions are to a great extent alterable by the colonists over time. One might hope they might be so altered. VI.12.6: Building Systems: This section investigates the structures, foundations, enclosures, and services required by the facilities proposed in Section VI.12.4 and distributed in Section VI.12.5. "Passive" systems (6 . 23) are considered first. Passive systems are those which, once constructed, perform their function with no requirement for outside energy. Foundations, structures, and exterior wall systems are very often of this type. These three define, enclose, and support facilities and their subservient spaces, creating a framework into
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