A bubble generating apparatus, the apparatus comprising: a housing comprising an internal chamber, an end portion, and a housing opening opposite the end portion; and an output assembly coupled to the housing, the output assembly comprising: a bubble formation surface, defining a first plane and having an aperture defined therethrough, the bubble formation surface being operable to receive a liquid through the aperture, wherein the liquid is operable to spread across a central opening defined in the bubble formation surface; and first and second shutter flaps (11b, 11c), wherein each shutter flap is operable to pivotably rotate from a first orientation to a second orientation; wherein, when the first and second shutter flaps are in their respective first orientation, an edge of the first shutter flap is adjacent to an edge of the second shutter flap, and the first and second shutter flaps are proximate to the bubble formation surface; wherein, when the first and second shutter flaps are in their respective second orientation, an air flow may be directed along a path through the central opening of the bubble formation surface and through the housing opening, characterised in that the first and second shutter flaps rotate in a second plane, and the first and second planes are substantially parallel. a housing comprising an internal chamber, an end portion, and a housing opening opposite the end portion; and an output assembly coupled to the housing, the output assembly comprising: a bubble formation surface, defining a first plane and having an aperture defined therethrough, the bubble formation surface being operable to receive a liquid through the aperture, wherein the liquid is operable to spread across a central opening defined in the bubble formation surface; and first and second shutter flaps (11b, 11c), wherein each shutter flap is operable to pivotably rotate from a first orientation to a second orientation; wherein, when the first and second shutter flaps are in their respective first orientation, an edge of the first shutter flap is adjacent to an edge of the second shutter flap, and the first and second shutter flaps are proximate to the bubble formation surface; wherein, when the first and second shutter flaps are in their respective second orientation, an air flow may be directed along a path through the central opening of the bubble formation surface and through the housing opening, characterised in that the first and second shutter flaps rotate in a second plane, and the first and second planes are substantially parallel. a bubble formation surface, defining a first plane and having an aperture defined therethrough, the bubble formation surface being operable to receive a liquid through the aperture, wherein the liquid is operable to spread across a central opening defined in the bubble formation surface; and first and second shutter flaps (11b, 11c), wherein each shutter flap is operable to pivotably rotate from a first orientation to a second orientation; wherein, when the first and second shutter flaps are in their respective first orientation, an edge of the first shutter flap is adjacent to an edge of the second shutter flap, and the first and second shutter flaps are proximate to the bubble formation surface; wherein, when the first and second shutter flaps are in their respective second orientation, an air flow may be directed along a path through the central opening of the bubble formation surface and through the housing opening, characterised in that the first and second shutter flaps rotate in a second plane, and the first and second planes are substantially parallel.