The rules for dressing for the office are completely different for men and women.

Perhaps no two people better exemplify the double standard than the most well-known executives working at Facebook : cofounder and Chief Executive Mark Zuckerberg, known for wearing the same grey T-shirt and jeans every day, and Chief Operating Officer Sheryl Sandberg, who is typically seen perched atop towering high heels.

Sandberg is arguably the most influential female executive in Corporate America, inspiring (or pissing off) many women with her book Lean In. Her frank openness about dealing with the sudden death of her husband last year was both heartbreaking and admirable. She's incredibly successful by every measure.

Yet on Wednesday, while watching her talk to Recode's Kara Swisher and Facebook Chief Technology Officer Michael Schroepfer, I caught myself staring at her shoes. Just look at them:

Here's a closer look: