Everything else in land law rests on the framework set out here. The chapter opens with the doctrines of tenure and estates, the statutory meaning of 'land' from airspace to buried treasure, and the test for telling fixtures from chattels. It then draws the central distinction between legal and equitable interests, working through the closed list in s.1 LPA 1925 and the formalities — deeds, contracts and trusts — that determine which side of the line an interest falls. The final sections examine the two legal estates in detail, from the fee simple and its determinable and conditional variants to the requirements of a valid lease and the lease/licence divide, before closing with reversions, remainders and the position of the life tenant.