Here is their demonstration with sliding panels together: https://www.youtube.com/watch?v=9HVLgJFRwBA https://www.youtube.com/watch?v=9HVLgJFRwBA You can see

Here is their demonstration with sliding panels together: https://www.youtube.com/watch?v=9HVLgJFRwBA https://www.youtube.com/watch?v=9HVLgJFRwBA You can see a little line on certain images (for example at 0:20) but maybe it's caused by the sliding mechanism, because there is no line on the left side assuming they are put together from two square panels same as the sliding one.