You should see those stairs without the gradient, yow...looks like a square bicycle tire. I looked at some real architects drawings and that's how they did them - just lines without a gradient - and I had no idea if they went up or down or what so I added the gradient to at least suggest some kind of depth. If you look closely you'll see that the lightest part of the gradient is where the door is thus suggesting that they ALL go down. They go up and down but I can't seem to portray Up as convincingly as I can Down. Maybe I'll try something else, shrug.