Lama Zopa Rinpoche explained the visualization when doing tonglen (taking and giving) meditation in this excerpt from the 26th Kopan Course.

In this excerpt from the 26th Kopan Course, Lama Zopa Rinpoche used the example of the table to explain emptiness according to the Prasangika Madhyamaka view.

Lama Yeshe: Lama's Concluding EEC1 Talk

Lama Yeshe gave this powerful teaching about bringing the Dharma to the Western world at the first Enlightened Experience Celebration (EEC1), 1982.