Tom Silva shows Kevin the systems he's devised for leveling out both the ceiling in the new open kitchen and the floor in the new finished basement, and he and Norm cut a hole for a new window. Landscape architect Cricket Beauregard shares her solutions for the shady front yard, taking Roger and homeowner Heather Faulds to see some of her work in other gardens around Arlington. In the second half of the hour, on ASK THIS OLD HOUSE, Roger visits Santa Fe to learn about "waffle gardening," a method of growing vegetables in an arid climate. Richard adds mechanical dampers to a forced-air heating system. Tom shows how to bisect angles. And the guys ask, "What is it?"