We can talk about left and right brain activities: the left being mostly logical and structured, the domain of mathematics and language, as compared to the right brain which is abstract and artistic, the realm of metaphor and vision. Conversely we can also talk about whether we are consuming meaning, or creating it. This gives us four distinct activities, which are almost always done together, fast-switching as it were. But, depending on our mood or present capacity, we can decide to focus on the one that might be best at that present time: creating meaning or consuming meaning (engineering, law, philosophy), creating abstraction or consuming abstraction (music, poetry, dance).

But there is also a fifth activity, that of stillness and simple empty sentience, which neither consumes nor creates, and is neither concrete nor abstract. The wellspring that balances and obliterates all others yet unborn.