You know, it’s always the last place we search where we eventually find it.
So, start with that last spot.

It’s not behind your ear?

Try to put it out of your mind. You subconscious will continue working the problem. Should wake you up at 2 a.m. with the answer.

@rebbel-So it’s definitely on the moon?

On Sesame Street they told Forgetful Jones to walk backward in his mind.

Retrace your steps.
I once wanted to place something in a secure place that was so secure , that I forgot where I put it! Took a long time before locating it..lol.

Think about where you might put it?
Check backpack , bags etc maybe you took it somewhere in one of these?

@lucillelucillelucille From experience I can say it’s definitely in that bottom drawer.

I hamster frantically around the house checking all my spots until it eventually turns up – sometimes in a usual spot and sometimes in a bizarre part of the forest!

Did you look under the couch?

Stop looking for it because it will show up

or

Buy a new one and it will be sitting on your table when you get home from shopping

Have you had any small children up in your house recently? If so, your notebook is probably history!

@Dutchess_III -No. They don’t have access to my studio.

I often close my eyes & start thinking backwards to the point that I suddenly remember. When that doesn’t work, the last thing I do before going to bed is ask myself Now where did I leave whatever I’m looking for Never fails, I wake up at 3 am going oh yes & I suddenly remember. I also keep something to write on on my night stand so I don’t have to get up right away to go get it. IF I don’t write it down, I’ll wake up remembering that I remembered, but won’t remember what it was that I remembered!!!

You put it in the drawer where it belongs so you wouldn’t forget it.

Apart from the other salient advice here, whenever I want to exercise some grey matter I jump to conclusions to jog my memory.

No but I sometimes lose my memory when I’m jogging.

I think back to the last time I saw it then work my way forward it time to the place where it is.

I sometimes imagine it in my hand , and picture setting it down. Usually, what comes to mind is a recreation of my memory of why it isn’t where it belongs, such as a sudden need to get to the bathroom, or hearing a window break. That leads me to the spot where I actually let go of whatever.

I reserve the right to claim my own odd behaviors on the grounds that they work for me.