Gau is a what we call a travelling shrine. Earlier when people travelled long route on horse, they used to carry their own Gaus to protect themselves from natural calamities, dacoits and overall for a safe journey. These Gaus were blessed by a Rimpoches (high priest) and oracles, so people believed the blessing from Rimpoches will guide them and keep them safe through their journey.
This Gau is hand carved with eight auspicious symbols on the side and the temple door in between with two dragons guarding the shrine. Below in the centre is the Zhidong (face of glory). Zhidong is considered very auspicious as well, you can see them in monasteries hanging on wall or pillar. This is a very old Gau, high quality work done and its in perfect condition.