 While, e.g., Alhazen (Ibn al-Haytham) had already observed an optical effect and developed a state of the art theory of the refraction of light, he was less interested to produce images with it (compare Hans Belting 2005); the society he lived in was even hostile (compare Aniconism in Islam) towards personal images.Western artists and philosophers used the Arab findings in new frameworks of epistemic relevance.E.g.