Devotions to artistic depictions of Mary vary among Christian traditions. There is a long tradition of Roman Catholic Marian art and no image permeates Catholic art as does the image of Madonna and Child. The icon of the Virgin Theotokos with Christ is without doubt the most venerated icon in the Orthodox Church. Both Roman Catholic and Orthodox Christians venerate images and icons of Mary, given that the Second Council of Nicaea in 787 permitted their veneration with the understanding that those who venerate the image are venerating the reality of the person it represents, and the 842 Synod of Constantinople confirming the same. According to Orthodox piety and traditional practice, however, believers ought to pray before and venerate only flat, two-dimensional icons, and not three-dimensional statues.