This is my to do list (aka whiteboard), which I stand against the wall. Problem is, it always slowly slips, and...suddenly SLAMS on my desk! Waking up the whole house! How can I let this whiteboard stay upright?

So, I had two modification ideas.
1. Sticking a 'block' to the table, so the bottom of the board could sit behind it, and not push forward.
2. Making a magnetic attachment to the wall.
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I tested both, and realised that I preferred the second option more, as the attachment was 'hidden'. I found some spare magnets - one would go on the back of the whiteboard, and the other on the wall.
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First experiment: using blue-tack to stick the magnets on. This was an easy solution, however, after a few pulls between the board and the wall, the magnet detached from the whiteboard. The magnet on the wall also fell (due to the small surface area + heavy).

Second experiment: Using double-sided tape between the magnet and the whiteboard. . this still didn't work, as double-sided tape does not work well sticking together hard surfaces. I needed a less rigid surface behind the magnet... paper!

Third experiment: Using paper 'in-between' to help stick the magnets to the whiteboard/wall. The paper provided a malleable backing material, and also created a larger surface area to stick the magnet on the wall.

After these experiments, I concluded that I would use both double-sided tape and blue tack, as well as paper (card). After a bit more quick testing to find the smallest paper sizes needed, I formed a final plan for my modification.

As shown above, I have used each of my materials for a specific purpose:

- paper - malleable (helps sticking), provides large surface area for wall hold
- blue-tack - adjustable + less damage on wall
- double sided tape - very adhesive (for paper)

- Paper (I used some scrap card)
- Magnets x 2
- A glob of blue-tack
- Double sided tape
- Scissors
- Whiteboard

Step 1: place your magnets on your card/paper.
For the wall magnet, I drew a border of approximately 1.5cm (+ruler for accuracy)
For the whiteboard magnet, I outlined the edge of the magnet.

Step 2. Sticking the magnets

- Cut out the outlines (box 1)
- Stick the double sided tape on the back of the magnets (box 2)
- Stick the magnets onto the card/paper (box 3)
- Spread 6 pieces of bluetack on the back of the wall magnet, and a strip of double-sided tape on the back of the whiteboard magnet (box 4)

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Step 3. Attach the whiteboard magnet to the top back of your whiteboard

Step 4: Attach the wall magnet onto your wall
- I first placed my whiteboard against the wall to find the approximate height for my wall magnet.
- You can then adjust the wall magnet to make sure that the magnet on the upright whiteboard and wall magnet are at the same level

And voila! They attach seamlessly and making a satisfying !click! together. There is also space on top to place a whiteboard marker.
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I am satisfied with my modification as I believe that I have successfully solved the problem of its ~slipping~, in addition, both of the wall and whiteboard attachments are quite sturdy!

However, I do notice that there are some ways I could further improve my modification:
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Ease of use: It takes a slight bit of effort to make the board and magnet 'click' at the right place (the magnet has a small vertical height and its' surface area is only on the side due to the plastic covering).
Perhaps, a taller magnet with a full metal surface area would make it easier to connect the two magnets, as well as having a more secure placement (higher magnetism). And, therefore, increase the convenience of attaching.
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Aesthetics: This is a small issue (since magnets are hidden), but I could potentially replace the card backing piece with another material, such as wood, to better its appearance.
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Sneak peak behind the scenes: my light set up