《迷墙深处：寻找自我的心灵之旅》情侣之间的滑滑梯是什么意思

　　The eccentric professor Collins lives completely secluded in his chaotic apartment. When the model Penny moves in next to him, he becomes fascinated of her. He drills holes in her walls and ceiling and peeps on her day and night. He loses himself in daydreams and delusions.