Create an image with three precast concrete pillars arranged side by side, each symbolizing one of the three pillars of sustainability: environmental, economic, and social. The first pillar features embedded greenery to represent environmental sustainability, the second is marked with abstract economic symbols like coins and gears for economic sustainability, and the third displays embossed silhouettes of people from diverse backgrounds to signify social sustainability. The background is plain to keep the focus on the detailed textures and symbolism of the precast pillars.