just cause you can't hear it don't mean it's not there

pretty spooky stuff i just realized. here i am, a human.
i'm looking at my speaker that is on but no sound is coming out. got my dog laying here and i get to thinking...is there sound coming out of that speaker that he can hear but i can't?

same with sight. just cause you can't see it don't mean it is not there.
maybe stuff in another dimension...

i just had the thought pop in my head so i thought i would share.