The Fijian gods (Kalou-Vu, Kalou-Yalo and numerous lesser spirits) were generally not made into any form of idol or material form for worship apart from some small objects used in ceremony and divination. However, it was more prevalent that certain places or objects like rocks, bamboo clumps, giant trees such as Baka or Ivi trees, caves, isolated sections of the forest, dangerous paths and passages through the reef were considered sacred and home to a particular Kalou-Vu or Kalou-Yalo and were thus treated with respect and a sense of awe and fear, or "Rere", as it was believed they could cause sickness, death, or punish disobedience. Others would provide protection. Thomas Williams and James Calvert in their book "Fiji and the Fijians" writes: