Steal Your Face

While most of this book is taken from the Vissudhimagga of Buddhagossa (Sri Lanka 430AD), a lot of this section here refers from the Abhidhamma, the third 'basket' of the Tipitaka, the three 'baskets' of Buddhist teachings.  Attributed to the Buddha, it was written down around 250 BC.

Here we are practicing skeleton meditation (in all ten directions) until 'all you see is skeletons.'

That is cool.