At noon, the meal was still haggis and steamed buns, as well as a few small dishes.

After lunch, it's time for a lunch break. However, except for a few people who went to sleep, most of them were not sleepy, so they got a few mahjong games from the farmers and started playing.

But Han Li didn't have this interest, or didn't have time. He wants to use this time, on the one hand, to code, and on the other hand, to keep an eye on the situation on the company's side.

Fortunately, it may be the strong request of the seniors of the previous years, and there is a signal here, but there is no network. Han Li can only use the wireless network card he bought to connect to the Internet, although the network speed of dozens of KB, or even more than a dozen KB is as slow as a turtle, but it is better than nothing.

In the afternoon, their class was still a photography class, and Han Li, Zhang Yiyang and a few other classmates had already set off to the top of the hill where the earthen fort was located.

It seems to be very advanced, but Han Li and they have been climbing for a long time. The steep and slippery mountain road made everyone suffer a lot. But fortunately, I was surprised to climb the mountain in the morning, and everyone didn't feel too tired.

After probably climbing for more than an hour, Han Li and the others finally arrived at their destination.

While everyone was cheering and celebrating, Han Li carefully looked at the ancient castle in front of him. Originally, Han Li's ancient castle was very small, but when he walked in, he found that it was actually quite large in front of him.

If it weren't for a neat inverted bucket-shaped earthen platform with relatively neat four sides, it could be vaguely seen that this was a remnant of human architecture. I'm afraid everyone thinks that this is a mound left after the weathering of loess.

On the top of the mountain, in addition to this earthen platform that is about ten meters high, that is, the beacon tower, there are also some damaged city walls and trenches outside the city walls. On top of these ruins, there are still some rotten wood and neatly polished stones.

You know, this is in the desolate Loess Plateau, and all the vegetation is basically low bushes, and thick rotten wood like this is probably brought from a long way at that time.

In addition, these stones are also very unusual. Anyone who has taken a geography class knows that the Loess Plateau is formed by the accumulation of the loess of the Outer Mongolia Plateau blown by the wind over hundreds of millions of years.

Therefore, there is naturally a lot of loess on the Loess Plateau, but there are few stones. And there are so many stones here, which shows that the builders attached great importance to this place at that time.

Ignoring the crowd that began to take pictures, Han Li began to search carefully on this ruin, hoping to find some clues to explore everything that this ancient castle had experienced.

Sure enough, inside the castle wall, Han Li found a few remnant bricks, which were half a green brick about twenty or thirty centimeters long. Seeing this, Han Li immediately became excited, this may be the Great Wall blue brick.

This kind of big green brick cannot be fired by private individuals, they do not have this need, nor do they have this kind of financial resources.

It is impossible to use such bricks for poor buildings, and they are basically used for the construction of some cities. This kind of blue brick can be found in this earthen fort, which is enough to say that this ancient fort was built in a unified manner, and maybe it was built together with the Great Wall in the north.

Brother Oak, what are you looking at? Seeing Han Li squatting there, Zhang Yiyang walked over and said curiously.

Hehe, I found something interesting, I'm going to take a picture of him. Han Li smiled at Zhang Yiyang, then picked up the camera and took a picture.

Isn't it just half a brick, what is there to shoot? Zhang Yiyang was puzzled.

Hehe, you don't understand. After taking the photo, Han Li stood up and said to Zhang Yiyang: "How is it, have you found a good angle?" ”

Zhang Yiyang nodded and said, "It's good over there, just enough to face the sunset in the west." ”

Han Li looked at Zhang Yiyang's hand and found that there were already classmates on the tripod, so he said to him: "Let's go, go over and occupy a position, otherwise the good position will be robbed in a while." ”

Pick the angle, set up the camera, and everyone began to wait. In fact, a good photo may only be for a moment. But for that moment, the photographer has to board for a day, an interest, or even a month.

Of course, it is said that some photo ambassadors have waited for years, if not decades, for a photo, just to capture that rare scene.

Just when everyone was bored and ready to wait, watching the position of the sun continue to change, the light and shadow on the ruins of the earthen fort are also changing. Han Li suddenly had a flash of inspiration and had an idea.

Why do you have to catch that moment, every change of light and shadow is a good photo.

So Han Li decisively gave up capturing and changed the shooting mode, he wanted to shoot these changes, and there is a professional term in photography, called time-lapse photography.

Time-lapse photography is actually very similar to videography, both are moving photos. But there are differences, such as time-lapse photography that only records photos, not sounds.

In addition, the video is generally 24 per second. As for time-lapse photography, it is far lower than this number, basically a photo in a few seconds, a few minutes, or even a few hours and days.

It's just that the time-lapse photos are combined and played at a rate of 24 frames per second.

The biggest element of time-lapse photography is that it must be stable, and the angle of the camera must not change during the longer shooting time in the future. Therefore, during the shooting process, the camera must not be moved.

This requires Han Li to fix the tripod and install the shutter release cable to avoid vibration of the camera when manually operated.

In addition to the time, because time-lapse photography is a long-term non-stop recording, a large number of photos will be generated, which requires Han Li to prepare a new large-capacity memory card to ensure that the photos taken can be stored normally.

I calculated the time and set the shooting frequency. Based on a three-minute time-lapse photo, the entire shooting time will be three hours long at a frequency of 2.5 seconds.

So for such a long time, Han Li's thing is only one, to ensure that the camera is stable. To this end, Han Li also took out a pen and paper and wrote a sign that said 'Do not touch it during time-lapse photography' and pasted it on the tripod.

Afterwards, Han Li could only pick up his mobile phone and play boringly. To be honest, the whole process was really boring, even a torment. But it can't be helped, that's how good works are grinded.

As the sun set, everyone who took pictures of the sunset walked down the mountain satisfied. And Han Li is still waiting, because his filming process is not over yet.

And Zhang Yiyang also stayed here with him in order to accompany Han Li.

Until the sky is getting dark, and the stars are everywhere. Han Licai was on the professor's phone, packed his things, and walked down the mountain.