Counterspy (Obojima)

You create an intricate arcane circle made of candles and sand centered on a point on the ground within range. The circle can have a radius of 10 feet or less. If at any point before the spell ends a creature outside the circle can see or hear you through magical or nonmagical means, the candle’s flames will change color. If a spell or magical effect was used, you are aware of it and understand the extent of its effects.