Abstract: A training aid for use by a player with a tennis racquet includes at least one wing having a proximal end in the throat of the racquet, and extending from that proximal end and tapering down into a distal end. A second wing may also be included, with the two wings extending in opposite directions from the throat of the racquet. When the player makes a stroke with the racquet with the aid attached, air pressure on the wings creates forces which provide the player with feedback on the position of the racquet head during the stroke. The training aid may be removably attached to the racquet, to allow the racquet to be used in normal play situations. A rotatable flap may also be provided near the distal end of at least one of the wings, so that when the flap is rotated the air pressure on the flap during a stroke is altered, thereby changing the feedback provided to the player.

Abstract: Disclosed herein is an amusement device, the amusement device having: a display device rotatably mounted to a structure, the display device being configured to create a plurality of images via a persistence of vision effect; a device for rotating the display device; a sensor for determining whether an object has hit one of the plurality of images; a microcontroller in operable communication with the sensor and the display device, the microcontroller changing the appearance of at least one of the plurality of images when the sensor determines that an object has hit at least one of the plurality of images.

Abstract: Disclosed herein is an amusement device, the amusement device having: a display device rotatably mounted to a structure, the display device being configured to create a plurality of images via a persistence of vision effect; a device for rotating the display device; a sensor for determining whether an object has hit one of the plurality of images; a microcontroller in operable communication with the sensor and the display device, the microcontroller changing the appearance of at least one of the plurality of images when the sensor determines that an object has hit at least one of the plurality of images.