WATER TANK CREATING PSEUDO-SPACE

PROBLEM TO BE SOLVED: To provide a water tank in which a person plays under such an illusion as flying in an agravity space or a large sky by providing a background picture imitating a space on the rear face of the water tank, forming a georama imitating a space city, etc., in the bottom face, and letting a toy, which travels by a remote control such as radio, spacewalk in the water tank. SOLUTION: When a toy 5 is floated in a water tank and, for example, a forward signal is transmitted by a radio controller 4, the forward signal is received by an antenna 57 of the toy 5 and input in a receiver incorporated in the toy 5. A micro-motor 53 is driven by the input signal and the toy 5 is started to submerge by the rotation of the screw 54. The toy 5 thus submerges and rotates to the left/right in the illustrated background picture 11 or an illuminated background image and the georama 12 imitating the space city so that it provides the person with a play as if flying in the space. The electric wave to the toy 5 is so constituted as radiated from the antenna 42 provided under the water so that the electric wave having a sufficient strength can be transmitted to the toy 5.