Water blindness

My 5-year-old brother and sister like to play in the water in the bathroom sink. I knew he was doing it when he ran out of the bathroom and ran to moms room. So I said"if there I water in there you better clean it up" he said "there's not!" So I go in there and sure enough there's water everywhere. He told mom that I had water blindness and could only see things as water and that's why I saw water.