While all current Bahá'í Houses of Worship have a dome, they are not regarded as an essential part of their architecture. Bahá'í scripture also states that no pictures, statues or images may be displayed within the House of Worship and no pulpits or altars incorporated as an architectural feature (readers may stand behind simple portable lectern). To date all the Houses of Worship built or planned have a single, undivided room under their dome. Furthermore, in all ten, the seats in the auditorium face the Shrine of Baháʼu'lláh in 'Akká, Israel. While each of the Houses of Worship is unique, the designs, through the selection of materials, landscaping and architecture, reflect the indigenous cultural, social and environmental elements of their location, to a greater or lesser degree.