Coasters, they’re there to protect your end table but no one uses them. Here’s a tip, make them more interactive! The Interactive Fish Coasters will reveal happy koi fish when you put a warm glass on them.

So first and foremost, these coasters only work with these glasses. Any others and the coasters will probably turn colors but there won’t be any cute fishes when you lift the glass. Although it doesn’t reveal how it works. I’m assuming that there are fish patterned into the bottom of the glasses that heat up and make the magic happen.

The liquid must be 68 degrees Celsius or higher in order for the fish to show up, which are orange against the brown background of the coasters. Honestly, the whole thing is pretty cute and will at least get someone to use the coasters, provided they’re drinking something hot. You can get a set for $50.