done in you know radar signal processing sonar walk communication systems etc and you can actually visualize this in a real network so this is just see far ten here's an input of an airplane here's the row this that this is the the row of the corresponding a matrix for that input vector unvectorized so that it looks like an image see it looks if you squint it looks a lot like an airplane okay I have a large inner product if you look at these other rows corresponding ship class dog class you see they don't actually look like a ship or a dog but