These are comfortable to view. The image can be large at any size, unlike Stereo-Pair where the limit lies in how wide you can squint your eyes. You will be astonished by the depth that appears and the all the different objects popping out.

The last picture is a bit exceptional. It is a room with a staircase. You walk with your eyes down the stairs so you end up on one floor and you can see which floor you are at by looking at the bars at the top right. You walk down the stairs from the left side of the image. On the eights floor, I feel my eyes are about to burst!