Blind imagination; the best colour vision in the world; the sixth, seventh, eight, and ninth senses; and how to train yourself to see light polarisation.
Some people, including a few famous ones, are unable to picture things in their mind.
The mantis shrimp can see more colours than any other animal in the world.
We all have more than the traditional five senses: proprioception, interoception, balance, and pain.
Bees navigate using sunlight polarisation patterns. And, with a little training, you can see them too.
The Generalist Academy 
