This panel was discovered in front of one of the crucial long sides of the aquarium. A a method mirror 25. 5 cm by 35. 5 cm was placed among the clear panel and the aquarium g. When the light bulbs were on, no image of the fish was displayed, and when the sunshine bulbs were turned off, the reflection of the fish was displayed on the mirror thus created. The other three sides of the aquariums were covered with black panels to guarantee visual isolation.