Get a large hanger, preferably made of soft wire, without paint on it.
We don't need the hook.
Let's cut it off.
Straighten the wire.
You may use any suitable tools.
It takes strong hands to do the work.
Get a piece of tubing that is longer than the wire.
The tube will protect the wire from water.
The wire should fit freely inside of the tube.
Thread the wire into the tube.
Each end of the wire should be 2-3 cm inside of the tube.
I have made a 1 meter long piece in this example.
Let's seal the end of the tube.
I use open flame to meld the edge of the tube.
And then pinch it with my fingers.
It can be done using a hot soldering iron, a hot glue gun, etc.
We have to bend the wire in a spiral.
Make the first loop as small as you can.
Make each following loop slightly wider than the previous one.
May the force be with you!
The alternative way is to tell your mom that you love her.
Then explain to her about the wire.
Moms are known for having force strong enough to bend the will of even the strongest people - the thin wire stands no chance!
Let's rephrase it: may your mom be with you!
The last loop is the widest - it is the base.
Cut off the rest of the tube.
Seal the end of the tube.
Push the first two small loops toward the base.
We have a spiral in a spiral.
Stretch the large spiral to a desirable height.
You may need to readjust the base loop.
Go over each loop to make it look nice and round.
I have made the holder about 30 cm height.
Make sure it's balanced.
It should fit in a standard 10 gallons aquarium or less.
Put the planter in an aquarium.
Secure the base with some rocks.
Some plants may look better than other in this planter.
Here is an example with the ornamental sweet potato.
And here is an example with peace lily.
Have fun and happy plants :)