Salim Mian, Salam. Actually you are conditioned to blankness. That is why you can't imagine any shape or colour. Kindly try to understan that you are deprived of realising the beauty of nature and it's extravagent existance. If you can't understand the depictions of walls in a temple, please stop appreciating your caligraphy in the masjid. I think I am more lucky than you about your prophet. I can imagine him, understand him and also fight with him like a friend.
