Simple Illusion

Area 
Creates a purely visual image that can be seen by anyone in view of the area it occupies. It may be a single object or an entire scene. It may move to a different area, or change size or shape up to its maximum area, if the caster concentrates. Any sapient creature can dispel it by “disbelieving” – taking a Concentrate action and making a successful Will roll. The illusion is automatically dispelled by any attack, any other spell except Control Illusion, or the touch of any sapient creature.

Duration: 1 minute. 
Base cost: 1 to cast. Half that to maintain. 
Prerequisites: Caster must be able to see and have IQ 11 or better.