Every type of art must be good-looking in order to be valuable. If art looks bad it is not worth it. This is theme of debate people who think art can look anything have a lot of arguments and main reason why they think so beautiful subjective concept. Every humans have their own opinion what is beautiful. For some individuals black color can look-good but for others black color can negative association with dark or evil for example.
For a lot of people who interest in art Vincent Van Gog one the most aesthetic painter of all time. But his paint work have critics by some humans because they think his paint work looks strange and ugly. In paint exhibition his works cost really expensive. This situation proved that not all humans think same in the question what is mean beautiful.
The most popular art work in the world this is probably Mona Lisa by Leonardo Davichi. Leonardo works always cost very expensive and foe the most of the people his works really beautiful. But some People think his work is overrated and some them write in for example Twitter his works looks ugly this is another example why beautiful is subjective concept .
In conclusion I want to say in personal opinion ugly arts work doesn’t exist because what beauty means is a different concept for all people. For some individuals just black square can look the most beautiful thing that their every seen but for others this meaningless