these panels are attached spernl so thaspecial sospecially. buildings grow and slink from summefrom-shrink from summer to winter. it's very difficult to do, but after a few of these buildings were built, 50 years ago, they figured out how to do it. >> and the same is true for the glazing as well. if the building sways in the wind or an earthquake the glazing can, also enough resilience that the glass doesn't hit anything. >> all buildings which sway. the biggest thing though, is, you want to design a building to be stiff enough that your body does not perceive the motion. the designers of this building, the code required -- stop it -- the code desired, designs, one, drift allowance, and they doubled it. because again, the bank who was the original owner said, money's no object, we want a conservative blt. and so a lot of times said the code said x, they designed for two-x. so when i have to work on this building, because i'm not old enough to have designed it, i just have the pleasure of working on this building, is whenever i'm doing somethin