The first time my parents sent me to ski in Dizin, about 25 years ago, I was 10. I continued skiing until I was 18. Once, we were on the bus going there — all teenagers, laughing, excited and having fun — when the police stopped us and asked us to get out of the vehicle. ‘‘You cannot continue your trip,’’ a policewoman said after checking out our outfits. We were shocked and kept asking why. ‘‘Your jackets are not long enough, and your thighs are showing,’’ she said. ‘‘We cannot allow these things to happen.’’ Without saying a word to one another, we drove back to Tehran.

My first day of shooting at Dizin recently, a security guard stopped me, pointing at my nondescript camera bag, and said, ‘‘You are not allowed to take a professional camera with you onto the slope, unless you have a special permission.’’ After a week, I got the requested permission and went back. It was a different world compared with my teenage experiences. There was loud house music everywhere. It was a very relaxed atmosphere, maybe the most relaxed atmosphere I have ever experienced in Iran: young boys and girls laughing, talking and hanging out, wearing the most colorful and hip ski outfits. You could easily see the excitement and joy on their faces.

What really surprised me was a billboard with a picture of a young snowboarder girl wearing a not-long-enough coat, laughing and taking a selfie with a cartoon monkey. In Tehran, you don’t see hip young women on billboards. Where I ate my soup, at the restaurant at the bottom of the slope, listening to the loud music and looking at the billboard and young boys and girls in their colorful outfits, is exactly where, 15 years ago, morality-police officers were constantly keeping boys and girls separate.

As a photographer who has been taking pictures for about 18 years in Iran, I always walk a narrow line. A security guard followed me everywhere in Dizin — not to stop me from talking to men, but to keep an eye on my work. ‘‘Make sure the women you take pictures of have appropriate headscarves,’’ he warned me. My profession here is always under scrutiny by both the government and the public, with all worried about their image.