>>11) so I painted a WHITE line on a bridge
2) I took a stick and painted a WHITE line at the same height as the line on the bridge
3) I took binoculars, fixed it to a stick and montaged it at the same height as the WHITE line in 2) and the same height of the WHITE line in 1)
Next I placed the stick from 2) 500 meter from the bridge in the water
Next I walked along and placed the stick from 3) 1 km from the bridge in the water
Climbed on the shoulders of my wife and looked through the binoculars if the WHITE line on the stick 500 meter away would be at the same height of the WHITE line on the bridge. If true it would mean the Earth would be flat.
Study shows that the outcome of this experiment does not conflict with the fact that you need flat shoe soles under your shoes. If the Earth would be a globe, curved show soles would be the standard, experts say.