Optical illusion: The internet is arguing about this photo: In which direction is the horse running?

It’s clear: the animal pictured here is a horse. However, the direction in which this black horse is running is causing confusion online. Is the horse moving forward, i.e. towards the camera, or backwards?

It’s clear: the animal pictured here is a horse. However, the direction in which this black horse is running is causing confusion online. Is the horse moving forward, i.e. towards the camera, or backwards?