This is a meditation focusing on the 4 elements and is in line with inner alchemy and the dao/tao. If you're into zen, yoga or martial arts, this might be a meditation that calls to you.
You will need to have a certain amount of silence to do this meditation. It is NOT a beginner meditation. You must be able to "silence" your mind, "turn it off," or focus/be in the empty space.
Choose 1 element and focus on it during a set amount of time (e.g. 20-40 minutes). It can be any element, your weakest, your strongest, the one that calls to you most, etc.
Make sure you are in the Wuji space (or Void) before you begin.
Once you are settled in that empty space, put in the intention (in other words, a thought form) of that element (e.g. Water). It could be words or just a picture in your mind.
Wait and see what comes. You might have to repeat the intention but the focus -like in all martial arts or even yoga- is that paradox of being relaxed under tension ;)
See what comes. Use your body as a template to feel the element: cold, hot, heavy, light, or the forms that the element takes (e.g. Water as liquid, solid as Ice, gas as Mist).
Explore the element in all its beauty, splendor and wonder. Merge with the element and let it teach you and guide you in its ways.
Return to the Wuji/Void and be sure to acknowledge the wisdom that has been shared with you.
End the meditation in the empty space of the Void, or continue on to the next element, as described in the Variations section.
VARIATION 1: 4 ELEMENTS CONTRAST MEDITATION
Focus on 1 element for a set amount of time (e.g. Air 5-10 minutes), then switch to another element for the same amount of time (e.g. Fire 5-10 minutes) and then repeat this sequence for the last 2 elements (e.g. Water 5-10 minutes and then Earth 5-10 minutes). Which element you choose 1st, 2nd, 3rd, 4th (i.e., the sequence) is up to you, as they all have something to teach :)
VARIATION 2: 1 ELEMENT DAILY MEDITATION FOR 1 WEEK
You can focus on 1 element (e.g. Water) for a daily meditation for 1 week to familiarise yourself with that element. The next week, Week 2, switch to a different element (e.g. Fire), and meditate every day on that same element. Repeat this meditation sequence for the last 2 elements (e.g. daily meditation on Earth Week 3 and daily meditation on Air week 4). Total time is 1 month. How long the daily meditation lasts is up to you (recommended 20 minutes or longer). You can of course meditate longer than 1 week on 1 element if you feel you need to spend more time understanding the element. 2-4 weeks is a good time frame for getting acquainted with an element.
Let your intuition be your guide. Keep your heart open and your mind free :)