A practitioner of Zen will tell you that everything you do should be done with a purpose, with awareness, and with intent. A Zen tea drinking meditation involves using intent and awareness in the preparation, making, and drinking of tea.
Often lots of people's third eye are not open because they are blocked. The third eye is a sixth chakra but connected to the first, second and third chakra's and blockages in this lower chakra's will also cause a blockage in the sixth. Oftentimes, the cause of blockages are fear and disbelief, though Tibetans and Indian yogis believe third eye is blocked for past life karma . Some people refuse to believe that they are blessed with a sixth sense while others are anxious of the images they might see once they have opened theirs.
To develop your clairvoyance, you must be able to attain a higher level of consciousness. You need to work on your spirituality and this can be done in several ways. The most common way is through tapping the power of your third eye. Another effective way is through constant meditation.