自2013年，摄影师兼动态图形研究师 Dan Marker-Moore 开始拍摄世界各地大都市的不同时间段的图片，然后再把这些时间段图片组合在一起，从白天到黑夜，呈阶梯式增长，最后你会看到现在的摄影效果。

[上海，由65张照片组成，耗时1小时53分钟]

Since 2013, photographer and motion graphics professional Dan Marker-Moore has tracked the passage of time in cities around the world through gorgeous "time slices," collages created by digitally merging dozens of individual photos captured minutes and even hours apart. With each strip representing a different point in time, the beautifully graphic images illustrate the transition from day to night through gradients, subtle motions, and the flickering of city lights as darkness falls.

[香港，由150张照片组成，耗时56分钟]

"I’ve done enough where I can stand in a location and visualize what a time slice in a location will look like," Marker-Moore explained his process to us via email. Often capturing up to 1,000 photos in a set period of time, he edits a selection of images in Adobe Lightroom and splices them together in After Effects. "The only curveball is usually the weather; it's hard to predict, sometimes. Usually it takes a few tries before I get a time slice finished. I experiment with how many slices and the direction of slices, as well as which segment of time to focus on. I will end up with a few drafts and refine the best one. Sometimes this can be a quick process, but often it takes a few days to get right."

[伦敦，由48张照片组成，耗时1小时36分钟]

Three years in, Marker-Moore has created time slices of LA, NYC, Shanghai, Hong Kong, London, Amsterdam, Tokyo, Chicago, and Toronto, among other metropolises. For each new city he visits, he likes to capture a time slice—his own way of preserving the memory of another place traveled. "I am attracted to cityscapes," he said. "They make for excellent time slices; as the sunlight dims, the city lights turn on."

[洛杉矶，由55张照片组成，耗时1小时10分钟]

[洛杉矶，由35张照片组成，耗时20分钟]

[洛杉矶，由72张照片组成，耗时1小时58分钟]

[新加坡，由32张照片组成，耗时1小时15分钟]

[纽约，由70张照片组成，耗时2小时10分钟]