A Giant Walking

I was walking my dogs in an area of large flat fields crossed by some dirt roads. I saw a walking character far away, in the other side of the field. The character seemed many meters tall. I kept following it with my gaze, and slowly, approaching me, the character shrunk to a size of an ordinary man. For some reason, the landscape produced an optical illusion which made the character seem to be further away, which made him look unnaturally tall.