Which famous architect is known for incorporating dramatic curved titanium surfaces that reflect light in constantly changing patterns, creating buildings that appear to be in motion?

The world's most renowned architects often develop distinctive design languages that become their visual signatures. These design elements can make their buildings instantly recognizable, functioning much like a brand logo in the commercial world. Test your knowledge of architectural branding and see if you can identify which famous architect is known for the described signature design element.

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Frank Gehry
Zaha Hadid
Santiago Calatrava
Norman Foster