Nighthorses generally relay what they receive from the ambient back to the ambient, giving riders in the vicinity access to what other riders are thinking or feeling. While this is useful as it enables riders to communicate quickly with each other without the need for words, it can be problematic when a rider does not want his feelings to be known to others. Riders quickly learn how to make themselves "invisible" to the ambient by sending images like <wind in the grass, wind bending the stalks, gently waving grass>.