Besides what sibling said- In a ++-- universe, you have two timelike dimensions but still just one time dimension. This is to say that one of the space dimensi

Besides what sibling said- In a ++-- universe, you have two timelike dimensions but still just one time dimension. This is to say that one of the space dimensions is timelike, which means you get effects like "time" dilation from ordinary rotation. Our own universe is +++-. Between Dichronauts and Clockwork Rocket, it's possible to get a good intuition for the underlying geometry that causes special relativity; something none of my physics textbooks even tried.