Abilities such as flying through the air, walking through solid obstructions, diving into the ground, walking on water and so forth are performed by changing one element, such as earth, into another element, such as air.

This is according to the Visuddhimagga, which is pretty much the only ancient text to actually describe how to obtain siddhis.

My question is, have you tried changing one element into another?

[Mod Edit: Just a reminder to people to please not answer in threads in the 'Ask Robert' section. However, there is now a copy of this thread here: http://www.astraldynamics.com.au/sho...t-into-another for those who want to continue the discussion.]