The Khajuraho temples feature a variety of artwork, of which 10% is sexual or erotic art outside and inside the temples. Some of the temples that have two layers of walls have small erotic carvings on the outside of the inner wall. Some scholars suggest these to be tantric sexual practices. Other scholars state that the erotic arts are part of the Hindu tradition of treating kama as an essential and proper part of human life, and its symbolic or explicit display is common in Hindu temples. James McConnachie, in his history of the "Kamasutra", describes the sexual-themed Khajuraho sculptures as "the apogee of erotic art":