For example, if you only wanted to see bees, you are unable to see anything unless a bee comes into frame, in which case you are only able to see a bee.
You could also decide to choose something that you cannot normally sense (e.g. hearing bat echolocation sounds)
taste one thing would be too easy as everyone would just choose pizza. fight me.
It’s also the least debilitating. Vision, hearing, smell, and touch are important to function in daily life, but you can still live relatively normally if you can only taste one thing.