@b0rk when debugging digital waveforms of chip designs, signals are typically supposed to be 1or 0. So the other states (x, undriven, or multiply driven, and z, tristate, a bi-directional line set up to receive) are highlighted in red or blue

@b0rk sometimes when debugging a bus that isn't just 1 or 0 but 16 or 64 bits, it can help to display them 'analogly' so if it's a counter you see the expected sawtooth pattern, or other big jumps in value can she up more easily than just as a tiny vector of numbers.