In earlier civilizations, there was much doubt about whether vacuum can exist. Ancient Greeks also did not believe vacuum is possible. In the medieval Islamic world, physicist Ibn al-Haytham supported the existence of a void or vacuum. He mathematically demonstrated that place (al-makan) is the imagined three-dimensional void between the inner surfaces of a containing body. The first suction pump was invented in 1206 by the Muslim engineer and inventor, Al-Jazari. In Europe, the suction pump appeared only in the 15th century.