Solar ovenThe light of the sun reflects several times on the mirror.
Solar pump We heat the first bottle which is empty with a lamp which represents the sun during 15min. The pression in the first bottle dicreases and when we switch off the lamp, the water in the second bottle goes in the first.
Water Fountain The water in the first bottle goes into the second bottle. The air in the second bottle goes into the third bottle. And the water in the third bottle goes into the first bottle.
Water lampThe light of the sun reflects inside the water and the bottle illuminates the box.