'Ma' (間) is a Japanese concept, an idea. I discovered it when reading Ariana Huffington's book Thrive, as the mention of it caused me to double back and think 'I'm going to want to remember this'.
It can be translated, roughly, as a gap, space, or interval between two things. It has particular application for philosophical and artistic ways of being, and 'ma' is intrinsically bound to both these things with great complexity, great subtlety. I've only just begun to read about it, and I'll be reading forever I'm sure, but it has already given me a renewed sense of being unhurried—a sense that not everything is so close behind me as I once thought it surely was.
It is space and it is time.