I can now see a room renovation in my future thanks to Gionatta Gatto. Gionatta Gatto is the designer behind the SMnS Clip, a door handle that lets you clip on notes to help you remember your errands.
Gionatta Gatto has also designed a hollow door handle intended to store notes/secret love letters. These designs truly are a delightfully low-tech way to keep yourself conscious of all the important things that need to get done in a day. Looks like the phone calendar is on its way out.