It's hard to imagine your vision working completely different than it does, which is why these illustrations helping people with "normal" vision understand what colorblindness looks like are so fascinating.
If you're not colorblind, seeing things without blues, greens and reds can be quite strange and even a bit creepy, but it's a great way to appriciate how things look for those who can't see those colors naturally.
You can see more samples like these at Bright Side.