This. Is. Amazing! After years of trying to guess which colors were challenging to him in each context, I can literally see for myself! I spent about 20 minutes just walking around my house with my mouth agape, seeing our home -and us! -the way he does. It is rare that we can truly experience what a challenge is like for someone else -and this app did just that. (I see what he means: unripe and ripe bananas are identical!)