The meditation I have worked out uses the sefirot of the Tree of Life to build a 'memory palace' in a fashion inspired by the ancient Art of Memory -- which is a bit of a topic in itself. Here's a summary to give folks a context for it.
The basic technique, first written down by the Greeks, uses a visualized image of a place (traditionally, a building, but it could be a garden, or whatever). The place is to have a variety of easily remembered rooms or parts, and into these places you can put an image of something to help you remember whatever it is you are trying to memorize - a name, for example. If you meet a guy named George, say, and he's a gardener, you could imagine a garden shed as your place, and on the wall, hang a sickle in the shape of a G. Then, to remember him, just go back to the garden and look on the wall of the shed.
Traditionally, the Art of Memory was used by orators to remember points of a speech, or later, by medieval theologians, to remember lists of various virtues and punishments for sins. And throughout its history, The Art of Memory has also been associated with magicians and mystics, who can use it to help remember various experiences, states of being, complicated meditations and such.
The intruiging bit is that, by creating this kind of construct in your mind-space, you can be surprised by emergent patterns and unexpected connections as you visit your Memory Palace and find something may have moved, or a new door exists where there was not one before, and it reveals a whole new perspective on things to you.
So I got intruiged by this Art, and realized the Sefirot can make an excellent Memory Palace, and the Counting of the Omer would make the ideal meditation for constructing it - with the added bonus that meditating on it as such can really fix the Sefirot better in your psyche. Quick, how many of you can tell me the difference between Netzach and Hod, off the top of your head? But if Netzach is a Golden Door in a garden wall, and Hod is a Copper Basin beside it, you can remember right away that Netzach is the energy that helps you get through obstacles (the wall), and that Hod, bearing that heavy weight of water, is that energy that helps keep you going steady under a heavy load.
Why those particular images, you ask? I'll get to that in a second.
So I decided that my Memory Palace would comprise the Sefirot. But I needed an easy visual mnemonic key, to remind me, at each point in my mental construct, what Sefira I was in. And for that, I remembered Reb Zalman's beautiful rainbow tallis, on which he placed a band of color for each of the seven lower Sefirot. So there was my key:
So each Sefira would be a Place in my Memory Palace, with its particular color dominant. I imagined Chesed as a Purple Pool in the mountains, because like a pool, Chesed is a wellspring of love and mercy. Gevurah I pictured as a Blue Castle, because Chesed is Strength, and I had just finished re-reading the Narnia books, so castles were on my mind.
We can go further in, then, to the Sefirot within each Sefira, by putting an object of the appropriate color in the place of the appropriate color. So in the Purple Pool of Chesed, you can place a Blue Sword for Gevurah, and meditate on that on the appropriate day of the Omer (in this example, day 2). Meditating on this may reveal some interesting things, as you ponder, 'okay, so how is the Strength contained within Lovingkindness like a sword lying at the bottom a pool? Hm, makes me think of the courtly love of the Troubadors; Strength inspired by Love, a sort of questing hopefulness and faith.'
And that's how I got a Gold (yellow) Door for Netzach, and a Copper (orange) Basin for Hod. At least, that's why I chose those colors.
If anyone likes, I encourage them to try the meditation by imagining their own set of places with their own set of objects therein, to represent the Sefirot with the Sefirot through the counting of the Omer. I'll post my own places and things that I come up with, which you may use in your own meditation if you prefer that to inventing your own.
Which brings up an important part - I'm making this up as I go, and I don't claim to be a Great Authority, nor have I been made one of the Secret Chiefs yet, and I don't suspect I'm one of the Thirty-Six Tzaddikim who sustain the world -- so don't take any of my own ideas as anything more than fanciful ideas. They are based on my own, still fledgling knowledge of the Tree of Life, and maybe I get something wrong. So if you can, study up on the Tree on your own, because maybe what I come up with doesn't work as well for your own understanding.
So I'll end with the first mediation, for the first day of the Omer when it comes. Each meditation will be a single line, followed by some of my own insights into the meanings of the images. I picture each of these places on as being on a Hill, and I'll lay them out as I go.
Perhaps this is the rock that Moshe struck in the desert. It's the very source of the pool of Lovingkindness, which lies among the rocks at the very top of the hill. At the heart of Chesed, which constantly sustains everything that exists, Chesed renews its own self constantly too.
Very Arthurian, I know. But I like the image of Strength surrounded by, immersed in, Lovingkindness. And that some Lady of the Lovingkindess Lake might bestow the sword to the worthy at need.
This is the Beauty of Lovingkindness. The reeds guarded Moses in the river, so I'm getting cradle-like place-of-refuge vibes here. Plus the flexibility implied by the reeds.
The Eternity (or Victory) of Love. This is perhaps a coin, a treasure found within the pool, or a golden platter. There is an implication of physical riches - Grace in the sense of Charity, perhaps. When Lovingkindness gives you just the coin you need to win your struggle. And as gold never fades, so Netzach endures forever.
The Hod of Chesed is the Splendor of Love. A beautifully shining dish of copper, with which one can draw forth some water from the pool at need. Maybe even pan for that golden Netzach.
The Yesod is the lingam of the Tree of Life, the center of sexual energy and longing. Here we have the waters of Chesed feeding a striking flower that arises from the pool. Desire that springs from Love.
Malkhut is about manifestation in this world. Here, the Malkhut of Lovingkindness is what give us access the the pool, the banks we can walk down to reach the wather.
Very grail-like. The mercy of the cup tempers the severity of Gevurah, and gives it purpose.
The seat of power, of Judgement. The Center of Strength.
A garden in the middle of the fortified castle. Beauty within Strength. Within the Strength of Gevurah is a place of balance and peace and even rest.
Eternity of Strength. The scepter of sovereignty by which authority the castle is ruled. The Will.
Splendor of Strength. The orb is the microcosm, the model of the world through which Gevurah comprehends the nature of existence so that Strength can be applied at just the right point to effect whatever change is willed.
Foundation of Strength. The inner keep and central armory of the castle, meaning a place of fortitude and a place where the spiritual tools of Gevurah are stored. The Will that directs Strength.
The Manifestation of Strength. The doors are both protection and passageway, and form the gate through which Gevurah manifests in the world.
The Lovingkindess of Beauty. The blossom is what gives fragrance to the whole tree.
The Strength of Beauty. Watchful, swift, and balanced.
The Beauty of Beauty. The nature of Tiferet is to ever renew itself from the central balance point of the Tree of Life.
The Eternity of Beauty. Once again with the ever-renewing imagery.
Okay, so a parrot is kinda odd, but it's what came to me. Also, Hod is Splendor, and parrots are quite splendid.
The Fruit of the Tree is a srtong archetype. In this case, the fruit of the tree of Beauty, of Balance, of Wholeness. That part of the Tree we can actually eat, and take into ourselves.
I imagine it to be bench-like enough to sit upon and gaze at the garden all around. This is the Manifestation of Beauty, it's concrete form, which we can see in everyone and every thing around us.
The energy of Netzach is a doorway through whatever obstacle you may find, but unless pierced by this window, who knows what lies behind the door, or if it's worth opening? Chesed lovingly gives a bit of grace to Netzach, letting us see a glimpse of the other side.
The Strength that upholds the structure of Eternity. The natural laws of the universe.
Mostly because I like the word 'shrubbery', but the image suggests the Life that abides in Eternity.
The Key to the Gate. That very thing within Netzach that can open a way through an obstacle.
This gives a hint of how Hod is instrumental to Netzach, because without a hinge, a door isn't much of a door.
Much like the carpet in the castle. In both cases, Yesod seems to be the road or path itself, and the desire to trave it.
The wall provides the context and support for the gate, but note that it is also the obstacle that the gate provides a way through.
Reminiscent of the big basin in the Temple. Hod is splendor, inspiring awe, and the wine of Chesed within is there to refresh the weary traveller.
The Strength of Splendor. What directly supports it.
The elephant may stand firm, but the turtle swims with grace.
Netzach does have a very solar/leonine energy energy, to me. If Hod is a moment of splendor, the Netzach of that is the eternity of that moment. Eternity can be vertical to 'time'.
I seem to recall there was some sort of copper serpent thingie in Temple times. Anyway, continuing with the iconic animal/direction/element kind of association.
Definitely going for the Ezekiel-style imagery here.
A gentle bear, but very strong.
Yesod has the energy of will and desire; I see it as a center of the ego - hence the house. And warming that house is the hearth of lovingkindness.
Hm, Strength as a Doorway. It can both keep out, and let in.
I picture this as the rug you always love to sink your toes into. A special, comfy place in the home, and thus a special place in the Self or Will that is Yesod.
The table bears up what is placed on it. Here in Yesod, Netzach is the energy of attention, a table at which we can examine what we will.
These glow with the splendor of the sunlight shining through them. The Hod of Yesod is the breaking through of divine effulgence into the house of the self.
As the house of Yesod shelters the self and its desires, so the roof shelters the house.
The hearth (Chesed) provides the warmth; the hearth-rug the place from which to snuggle up and feel it. The down-to-earth desires for good, wholesome food, a homely house, and the warmth of love.
The Hill upon which everything stands.
I imagine a waterfall coming down from the pool, to run in a stream beside the castle.
The stream mentioned above runs into a walled garden, at the center of which stands this Tree.
The stream would also flow under the wall, into the garden.
What underlies existence itself, which is (paradoxically enough) ultimately empty - so it circles back to Ayin.