Sneakoscope - A device which looks something like a gyroscope and which gives off a whistling sound when someone untrustworthy is around. Harry was given a small one by Ron (who bought it in Egypt while on holiday). It was a cheap souvenir so the boys ignored it's warnings (PA1)
Moody/Crouch has a large one in his office. (GF20)
Foe Glass - One of the devices owned by the ultra-paranoid Moody. He kept it in his office. It looks like a mirror, but it shows enemies as shadowy, indistinct figures; when the enemies get closer, they come more into focus. (GF20,
Secrecy Sensor - Another of Moody's devices. This sensor resembles a collection of old-fashioned TV aerials, except that they pick up vibrations of evil approaching. (GF20)
:::>^..^<::: ~*~The Journey is more important than the end or the start~*~ :::>^..^<:::
The doors of Hogwarts are semi-sentient. Flitwick teaches them to recognize a picture of Sirius Black when everyone was afraid Black would try to get into the castle (PA
The door to the high security vault in Gringotts would only open when a Gringotts Goblin would run his finger down it. Then the door melted away. If anyone else tried that, they would be sucked through the door and trapped inside the vault. (SS5)
The door to the kitchens in Hogwarts is a painting of a bowl of fruit. When you tickle the pear, the door giggles and opens.
c.f. The Fat Lady
c.f. the entrance to Dumbledore's tower
:::>^..^<::: ~*~The Journey is more important than the end or the start~*~ :::>^..^<:::
Remembrall (SS9)
A glass ball the size of a large marble, full of white smoke. A Remembrall tells you if there's something you've forgotten to do by glowing scarlet. Neville receives one from his Grandmother and it glows red soon as he picks it up.
:::>^..^<::: ~*~The Journey is more important than the end or the start~*~ :::>^..^<:::