The following things are deemed to be personal property:
(1) Those movables susceptible of appropriation which are not included in the preceding article;
(2) Real property which by any special provision of law is considered as personalty;
(3) Forces of nature which are brought under control by science; and
(4) In general, all things which can be transported from place to place without impairment of the real property to which they are fixed. (335a)