Which architectural product company's logo was specifically designed to represent the crystalline structure of cement paste under a microscope?

Corporate logos in architecture and building materials have evolved to become powerful symbols of quality, innovation, and design philosophy. Some architectural firms and building material manufacturers have logos so distinctive that they're instantly recognizable to industry professionals. This poll tests your knowledge of iconic branding in the architecture and construction world. Can you identify the correct origin story behind one famous architectural brand's logo?

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Holcim (formerly LafargeHolcim), with its circular symbol representing the microscopic structure of hardened cement
Knauf, whose blue wave logo represents the flow properties of their gypsum products when mixed with water
Saint-Gobain, with their bridge logo symbolizing the company's role in connecting traditional and modern building techniques
Armstrong World Industries, whose interlocking A-shapes represent acoustic sound waves being absorbed by their ceiling products