The impossibility of the object of a contract may be: Physical , or when the thing or service in the very nature of things cannot exist (e.g., a dog that can fly) or be performed. Moreover, when we talk of services, the impossibility may be: a) Absolute , or when the act cannot be done in any case so that nobody can perform it; or b) Relative , or when it arises from the special circumstances of the case (e.g., to make payment to a dead person, to drive a car on flooded highways, etc.) or the special conditions or qualifications of the obligor (to paint a portrait by a blind person, etc.).[1][2] Legal , or when the thing or service is contrary to law, morals, good customs, public order, or public policy. [1] Articles 1266 and 1267, Civil Code. [2] De Leon. (2014). Obligations and Contracts.