I did have the little symbol of glider with wheel down and up, while I have perfect distance vision and did not need reading glasses at that time, I could not quite make out which symbol was which. I do like the idea of a colored arrow, I will put that in my glider ( better than the red or green quarter sized paint dot). Also, a poster mentioned "unmistakable". I have experience in all aircraft except balloons, and I can tell you humility is a good quality. I have made the same mistake I have another pilot making, while wondering, how could any pilot make that mistake, question answered. Our sport is not very forgiving, so stack the odds in your favor. I now fly with a finger tip oyxgen meter. Take great pains to stay well hydrated before and during the fight. I go on o2 at 10,000 as I live at sea level. Will this keep me from screwing up? I really try to keep thinking and checking my thought process, but I have learned we can screw up and hopefully muscle memory will not fail us. Stay my fellow pilots!