Red, yellow, blue buttons. I worked with VisualWorks (nee Objectworks) for many years, and red/yellow/blue button events were still in the low level user input

Red, yellow, blue buttons. I worked with VisualWorks (nee Objectworks) for many years, and red/yellow/blue button events were still in the low level user input processing of code. They predated the semi-standardization of mouse buttons. I still have a strong synaptic response for them. My brain just automatically knows what kind of operations it will find for each of those colors.