Answer:
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
What is red and nailed to a wall?
What can be underwater, under fire, on fire and taking water all at the same time?
What is the freedom of birds and the pen of old men?
Thousands of these come together to make a digital image. What is it?
People take me on walks and I run and have fun. What am I?