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炎夏中的清山塾展場的瓦頂不時漏水，此情景展現了這空間中頗大的溫度差異。我以此環境特性為作品的起點，思考生活中「視覺」層面上被溫差影響的現象，其中海市蜃樓（Mirage）就是一個由溫差引起的幻象。
我對熱力帶來的幻象十分感興趣，並嘗試把熱力和聲音於空氣中的變化轉化成我們可視可聽的裝置。紋影（Schlieren）是拍攝氣流變化的一種應用技術，作品中展示了此技術的設置，熱力的變化影響光線於鏡片的折射，我們的眼睛透過相機得以看見空間中的熱能。觀者靜止或走動及空間中的溫度均會影響觀者的體驗。
這些本來我們不可視的變化及能量（如熱能及聲能），無形地影響著我們的「觀看」。觀者與裝置互動，感受一種錯置的幻象體驗。
技術陳述
作品中使用的紋影（Schlieren）拍攝需要合適的光源、精確放置的鏡片、用於擋光的刀片、一塊球體凹面鏡及一部數碼相機。
明亮的光源對準凹面鏡後，鏡子將光線反射到鏡頭前方焦點的位置上，而刀片恰好擋住穿過鏡頭的部分光線。當氣體密度均勻時，光線折射率相同，光線進入相機也是均勻的；當氣體密度不同，光線經過這個區域時折射情況就不同。有的進入攝影機，有的則被刀片擋在外面，攝像機裏面圖像就會顯示出陰影的不同變化。
另外，我結合了骨導揚聲器 (Bone Conduction Speaker) 及3D列印技術設計了一個骨導聲音設備 (Bone Conductor Sound Device)。骨導揚聲器是用於聽取聲音的技術，即通過將聲音轉化為不同頻率的機械振動，把聲波通過人的骨體傳至神經傳遞。相對於通過振膜產生聲波的經典聲音傳導方式，骨導省去了許多聲波傳遞的步驟，能在嘈雜的環境中實現清晰的聲音還原，而且聲波也不會因為在空氣中擴散，令聲音不會被他人聽到。觀者除了載上設備外，亦可於牆上的裝置體驗骨導聲音傳導方式。
Tile roof leak happens during the hot summer in Casphalt. This phenomenon reminds us of the obvious yet invisible temperature change in this space. I make use of this material characteristic in this space as the starting point to explore the visual phenomenon of temperature difference in our surroundings. For example, Mirage is a daily optical illusion associated with temperature difference.
I transform the intangible change in heat and the sound in the air into a visible and audible installation. Schlieren imaging, a photographic method of visualising the variation in the air current, is employed in the installation. The variation of heat affects how light reflects on the mirror, hence our human eyes are able to observe the invisible heat energy in the space. Audience could interact with the installation while immersing themselves in an illusion through the visualisation of the air current. The movement of the audience and the heat in the space is affecting their visual experience.
Those invisible changes and energy in the air, like heat energy and sound energy, is altering our ’seeing’ in an intangible way. The interaction between the audience and the installation becomes a special perceptual experience.
Technical Statement
Schlieren Imaging in the installation requires a suitable light source, precisely placed lenses, a blade for blocking light, a spherical concave mirror, and a digital camera.
First, the bright light source points at the concave mirror. Then, the mirror reflects the light to the focal position in front of the lens. When the gas density is uniform, the refractive index is the same. When the gas density is different, the refraction is different when the light passes through this area. Some of the light enters the camera or blocked by the blade. The camera will capture the changes in the shadow.
Apart from that, I combined the technology of Bone Conduction Speaker and 3D printing to design a Bone Conduction Sound Device. Bone Conduction Speaker is a technology for listening, by converting the sound into mechanical vibration of different frequencies. The sound waves transmitted to the nerves through the human bones. Compared with the classic sound conduction method of generating sound waves through the diaphragm, bone conduction eliminates many steps of sound wave transmission. It achieves sound restoration in a noisy environment. The sound waves will not diffuse in the air, which means other people would not hear the audio. Besides wearing the device, the audience could also experience the bone conduction sound transmission through the device on the wall.
