I have a question for my readers who are familiar with horses.
I understand that horses are reluctant to walk on ice, for the same reason that humans are: it's slippery, and they are in danger of slipping. Are they smart enough to recognize ice from its appearance? If you were riding horses in a studio on a surface that looked like ice, but was not (think green screen background on which a frozen-over river has been projected with ice and snow simulated in the foreground), would they be so afraid of the appearance that they would be reluctant to walk across it? Or do they only respond to actually slipping on ice?