What I might do with this would be to let the stairs climb much higher, possibly causing them to curve, maybe doing an 'S' curve, as it goes off into the hazy distance. Using Edit/Multi-replicate feature will bring up the window for just that sort of work. Besides, it's fun to test different values here, to make objects spiral off in any direction. Just add a number of repeats and small degree numbers for X, Y and Z changes, using from one to three of these values in different ways. The resulting numbers of repeated objects might not look right as you experiment, but they will be highlighted after enacting them. That way, if you don't like what you get, just delete them. The original shape will not be highlighted and will remain where it was.