Minor Illusion

You create a sound or an image of an object.
The illusion ends if you dismiss it as an action
or cast this spell again. If you create an image,
it must be no larger than a 5ft cube. Physical
interaction reveals it to be an illusion.
If a creature uses its action to examine the
sound or image, the creature can determine
that it is an illusion with a successful
Intelligence (Investigation) check against
your spell save DC.