In geomantic terms, cacti can commit "sharp-horned evil spirits". If you put it on the windowsill, you can dissolve the rage outside (if any). If not, don't put it anywhere.
But from the perspective of modern science, cactus and cactus can absorb carbon dioxide at night and purify the air. Moreover, cactus and cactus can absorb radiation and prevent cancer, and can be placed next to the computer.
Besides, putting a pot on the windowsill can not only purify the air, but also prevent thieves. Kill two birds with one stone.
This kind of thing has two sides, the key is how you look at it.
Sincerity is the spirit!