We all know there are lot of Hinduism temples where idols are standing from many centuries best example is Lord Venktaeshwara in Tirumala, Tirupati.
This idol is standing from many centuries it survived from those many thousands of years. What construction technique they used earlier to establish a idol in temple to last so long? For example nowadays they use cement to establish idol in temples but cement were not available during those time, so what was the technique they used to make idols stand and survive for so long?
I am sure people say Lord Balaji is self manifested not built by human being (but there must be some sort of physical support right for idol to stand), but there many idols established by saints like Adi Shankara etc. So what they used in-lieu of cement to establish an idol?
Can anyone please shed some light on this? I am confused from many years on this topic!