5 Buddhas - Vairocana (Tibetan: primordial)
Vairocana is the enlightened aspect of the mind that transforms ignorance and stupidity into intelligence and wisdom.
The ignorance we talk about here is not the lack of culture but it is the root of all mental poisons. It is a polluting factor that prevents us from understanding what really harms us and what, instead, truly helps us.
Ignorance is heavy, dense and depressing so its opposite is the luminous space of Vairocana.