This is simply sticky back plastic (bought from staples) stuck onto a low window or sliding door.
Use masking tape to tape up the plastic with the sticky side facing away from the glass. This may sound really obvious but do not stick to the glass as it will be tricky to remove.
Now that you have your sticky plastic facing out let you child stick, peel off and restick whatever you have to hand. We used felt animals and made a little farm. We even turned it into a simple counting activity.
But why not try some of these ideas from other mummy bloggers,
Be creative and your growing toddler will have hours of fun.
NOTE: Sticking it up with Masking Tape seems to work best but if you leave it up for more than a day you may be left with a sticky mark, if this happens wash with soapy water and use a wire scourer to remove any stubborn sticky bits.