Boston’s Central Artery has the potential to become an additional link to the city’s historic park system, the Emerald Necklace designed by the Olmsted firm. Its dimensions and linearity, evoking a river and its banks, could easily transition into the city’s already well-established system of parks. The conquest of this piece of territory gives it, paradoxically, a certain virginity, or at the very least it recalls the approach practiced in the 19^th century. The prevailing naturalism of this period is appropriate for such a site, even today, and appears to be of a great modernity. The invention of an elementary landscape, essential at the scale of this emblematic area of the city. We imagine a powerful tree layer, geographic, a sort of green pedestal for the city. This landscape spreads into certain lateral ramifications. The device we propose is also the adaptation of forest techniques in an urban environment. As in forest plantations, the trees are organized on an orthogonal grid simplifying the plantation and the maintenance. In an urban situation, the regular geometry allows a great visual transparency despite the tree density.