The DA candlestick project?  

I like
the one linked by ite well enough to want to give up now. But it's been a long day. . .

it reminds me of the de...
it reminds me of the de stijl lights, don't give up! A lot of the stuff on that page struck me as being kooky for the sake of it though.

recycling candle stick holder...
how about a candle stick holder that captures the drippings in a new candlestick form with a wick imbedded so the candle wax is recycled? Maybe every third or fourth candle a new candle is generated in the catch mould.

Question:
Do candle making and burning candles produce emissions that contribute to global warming?
One candle seems a small thing. But there must be millions or hundreds of millions of candles being burned each day. What does a candle emit?

how about candles...
with their own drip gutter moulded into the candle itself?

recycling
What to do with the remnants?
Why don't candles burn all the way?
Maybe our candlestick should be yet another static, ceremonial looking thing with archaic references because that is what makes a candlestick, but I'm loving the thoughts of spirally devices, gatlin gun references, and recycling ideas.
Perpetuum Mobile anyone?

Dear Koen, by showing these...
Dear Koen, by showing these images, I wanted to show various existing typologies.
Single or multiple candles - fixed or mobile - wooden, plastic, ceramic, glass, metal candelsticks. They are zillion of different candlesticks.
I am not a professional, but this is how I proceed before setting on the paper some ideas for new products. I first take note of all the objects that I know and I try to find the one that answers my needs as a user. If I do not find that object then I determine the aspects which I would like to see improved and I start working on this basis.
Concerning the candlesticks, my principal frustrations are the following:
1. The difference in thicknesses of the candles which, according to manufacture, are a little too thick and difficult to introduce into the candlestick or, on the contrary, are unstable when they are slightly too narrow. The constraint of only one size of candles is also an embarrassment.
2. The inconstancy of the lighting, which varies according to the height at which the flame is located. Inevitably, when the candle melts, the flame goes down and lighting changes.

Ive been looking around and...
Ive been looking around and have found some really interesting looking interpretations on the menorah produced in the 70's, they turn up on ebay sometimes.
Brass is nice and polishing it is something for the kids to do, something metabolist which can take tapers and tealights? Two short lengths of brass tube (c.22mm and 40mm dia.) where the tube holding the taper sits inside and below the larger tube so that the tealight sits flush and the drippings from the taper collect in the gap, a brass rod could run through and connect each tube, and the rod could slide into a central stem.
Alternatively the cup could be cast and the rod screw into it.

Patrick's
comments on fitting of different candles is right on. Surely an improved candle socket, perhaps springy to accept slightly different candle diameters, is the least we can expect form a new design ?
SDR U S A

find out what the most...
find out what the most common candle size/shape is and sell those candles with the holder? Or sell a small selection of smaller tubes which sit inside the larger tealight holder.
Or some sort of silicon rubber cup with inward and downward pointing barbs?

There are variable sized sockets for ...
nuts and bolts. One approach is a bed full of spring loaded spines. You push the spines down on the nut and the ones in contact with the nut depress, while the one beyond the nut stay sticking up and form a socket around the nut or bolt head. Not sure how you could do this with a round candle.

A single
A sinlge vertical spike would be the easiest solution to varying candle widths ?

Depending on the type of wax...
Depending on the type of wax or the temperature (?) a spike can crack the candle and make it impossible to re-locate on the spike. , in my experince anyway.

So..
Spikes and barbs are out of the question..
what about some sort of concentric, spiralling spring?.. I realise it will get full of wax, but it would suit many sizes of candle and grip quite well?

This sort of thing
but more V shaped
and hidden..
or not ?