The document discusses the law of property and equitable interests. It notes that while the Law of Property Act 1925 aimed to limit legal estates to two types (fee simple and leasehold) and provide certainty, the existence of numerous equitable interests has undermined this purpose and created uncertainty. Equitable interests refer to situations where someone has obtained a title that is not legal but equity will still provide a remedy. The document questions whether the Act has been effective in providing certainty given the failure to limit equitable interests.