Since the start of Israel’s war on Gaza, Palestinian artist Sliman Mansour has had trouble focusing on his work. “I haven’t been able to produce much art,” he tells The New Arab. “I have only made three or four paintings in the last couple of months. Usually, I do much more, but then I listen to the news and it becomes hard to concentrate.” It was only at the end of February that Sliman Mansour’s friend and colleague, Fathi Ghaben, died after Israeli authorities did not allow him to leave Gaza to receive medical help. Ghaben, like Mansour, was a renowned Palestinian artist, and aside from thei…