(a) Anything which is intended to remain permanently in its place even if it is not actually attached to the land is a fixture which constitutes a part of the realty and passes with it. (b) Machinery which is not actually attached to the realty but is movable at pleasure is not a part of the realty. (c) Anything detached from the realty becomes personalty instantly upon being detached. (Orig. Code 1863, §§ 2198, 2199; Code 1868, §§ 2193, 2194; Code 1873, §§ 2219, 2220; Code 1882, §§ 2219, 2220; Civil Code 1895, §§ 3049, 3050; Civil Code 1910, §§ 3621, 3622; Code 1933, § 85-105.) Mercer L. Rev. 343 (1964). For article discussing U.C.C. provisions establishing a security interest in fixtures as a means of protecting sellers, see 16 Mercer L. Rev. 404 (1965).