**Create an illustration where the horse is sitting by a brook, completely lost in thought. The tranquil water reflects the horse's form, but with a slight alteration - it appears as a unicorn. A single leaf floating on the surface of the water is positioned just right to create the illusion of the unicorn's horn. Use light and shadow creatively to enhance the illusion and to showcase the serene environment around the brook. --ar 4:3 --seed 1116014115 --v 5.1 --s 250** - <@885031474930278511> (fast)