Sayyidah Duba'ah bint al-Miqdad bin al-Aswad (may Allah be pleased with her) narrates from her father that he said: "I never saw the Messenger of Allah (peace and blessings be upon him) pray towards a pillar, a piece of wood or a tree except that he (peace and blessings be upon him) would place it in line with his right or left eyebrow, and he would not stand directly facing it."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17744