#275: pinnate

the pinnate structure
reveals the architect's feature
exalting nature

This is the concept art for the Zayed National Museum in Abu Dhabi. The architects are Foster + Partners (perhaps a long-lost relation?). The feather-like lightweight steel structures are "sculpted aerodynamically to act as solar thermal towers. The heat at the top of the towers works to draw the air up vertically through the galleries due to the thermal stack effect. Air vents open at the top of the wing-shaped towers taking advantage of the negative pressure on the lee of the wing profile to draw the hot air out."

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DEFINITION of this 2-syllable adjective:

1. resembling a feather, as in construction or arrangement; having parts arranged on each side 
   ​of a common axis: a pinnate branch; pinnate trees.
2. Botany. (of a leaf) having leaflets or primary divisions arranged on each side of a common stalk.