A strange slit has appeared in the living room. It clicks when I approach it, but is often propped open to allow me to pass through. Can only conclude that it is some form of crude diffraction grating. The aim must be to split cats into their fundamental colours, no one ever wants to take us tortoiseshells at face value. Reading into early experiments, diffraction work was first done with bird feathers. I approve. Will work on acquiring bird feathers and attempting to pass through them.