Looking

The Teenager - Mum have you seen my sunglasses?

Me - No.  Where did you have them last?

The Teenager - I had them on when I cut the grass and I left them on your desk.

Me - Well I'll have a look but I haven't seen them.

Fast forward a week ...................

Me - Have you found those sunglasses yet?

The Teenager - No I've looked everywhere and can't find them.

Me - Have you checked that pig sty you call a room?

The Teenager - Yes I've looked but I can't see them.  They're definitely not there.

Me - Well keep looking.

Fast forward another week ............

The Teenager - Mum!!  You know my glasses?

Me - Yessss????

The Teenager - Well I've found them.  

They were behind the monitor on my desk and I just never saw them!

A classic case of "I'm looking but I'm not seeing".