Create a simple and clear image featuring a central, robust precast concrete column. Surround it with three distinct pillars representing the three pillars of sustainability: environmental, economic, and social. The environmental pillar is adorned with green foliage, the economic pillar features subtle engravings of coins and gears, and the social pillar is embellished with diverse human silhouettes. Keep the background plain to emphasize the pillars and the central precast concrete, showcasing their symbolic significance in a straightforward, impactful way.