To dream of a tripod suggests accuracy and precision.
To dream of defecating on a person could mean that you have unresolved anger towards that person. If another person is performing this action on you, this indicates a poor self-image or unresolved feelings of guilt.
To dream of a decoy suggests that you are being distracted from your life path thus suggesting a need to be strong in your choices and follow through. To dream of more than one decoy implies that you may be easily distracted and often find justification for giving up. To dream of a decoy that doesn't succeed in distracting you indicates that you have time to gather resources necessary for an exciting change.