A comprehensive review, or what has been variously described as the classification or mapping or taxonomy, of constructive trusts would require analysis of areas of law as diverse as vendor and purchaser transactions, the perfection of imperfect gifts, fully secret and half secret trusts, breach of fiduciary duty, and accessory liability for breach of trust, among several others. The search for an acceptable, universally acknowledged, principle for the establishment of a constructive trust, which gives coherence to past decisions and provides a clear guide for the future, will certainly prove elusive in relation to the many different areas of law and fact in which constructive trusts arise.