You can scroll through the posters below, and click on them to enlarge:
The official account shared downloadable high resolution versions of the posters on Twitter. From these downloaded files, Twitter user @lynx_time discovered that there was a hidden layer which contained an overlay of weaves for each of the posters.
Other Twitter users then pointed out that the weave posters fit together to form a pattern.
According to the official show account on Twitter, these posters were designed by Studio Ronin.