Close one of your two eyes. Move your head close to the monitor and watch concentratedly to the left circle if you closed your left eye.
You should look to the right circle if you closed your right eye. Keep watching and move your head slowly backwards while checking the other circle. What happens? And how is that possible?
The Eiffel tower in Paris has including the tv antenna an height of 321 meter. It is made out of 7 million kg steel. Somebody would like to build a scale model of this tower with a weight of 1 kg. How tall
will this scale model be?
