| 摘要 |
A cardboard construction for use with a pet cat providing a tunnel-like maze of walk-through passages into which there is an entry of ambient light and correspondingly various sites of different levels of ambient light within the passages as a function of the distances between the point of ambient light entry and the sites, and wherein the pet cat in the exercise of natural instincts selects sites for eating, sleeping, playing, and like routines.
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