A floating device for use on a water surface is disclosed. The floating device comprises: a generally spherical hollow body defined by an equator line, a top pole and a bottom pole. The floating device further comprises a non-flat floating member, being inside the hollow body and having an apex constituted to support the top pole when the floating device is placed on the water surface. The body of the floating device is formed with at least one opening at each of the top and the bottom poles, and with an arrangement of openings circumferentially distributed above and below the equator line.
