Grouping vases: height, number, spacing

Odd numbers look calmer

Three or five pieces look as though they belong together; two or four look arranged. The reason is that even numbers invite the eye to pair them – you see two times two instead of one group.

With more than five pieces the effect changes again: the group becomes a collection, and that needs different rules, usually a surface of its own such as a shelf.

The difference in height must be clear

Three vases of 18, 20 and 22 cm (7.1, 7.9 and 8.7 in) look as though someone tried to buy three vases of the same height and did not manage it. The gap must be large enough to read as intention – as a guideline, each piece is at least a third taller than the one before.

In practice, for example: three vases of around 10, 16 and 25 cm (3.9, 6.3 and 9.8 in) produce a progression in which each height remains distinct. From 10 to 16 cm (3.9 to 6.3 in) is a good sixty per cent increase, from 16 to 25 cm (6.3 to 9.8 in) another good half – both steps are well above the one-third mark.

The rule is relative, not absolute. With small objects a few centimetres of difference are enough; with floor vases it takes correspondingly more. If you are unsure, place the pieces side by side and take two steps back: from that distance it becomes clear whether the heights are read as three steps or as one uneven line.

The diameter should change along with the height. If the tallest piece is also the widest, the progression looks natural; a tall, very slender piece next to a low, bulbous one can work, but it requires the two to be closely related in every other respect.

One thing in common, one difference

A group needs something that connects and something that separates. Everything the same looks dull; everything different looks random.

Tried and tested: the same material, different forms. Three ceramic vases in different silhouettes. Or the other way round: the same form, different materials – the same slender cylinder once in cement, once in ceramic, once in stone.

What rarely works is three vases that differ in material, form and colour at the same time. Then there is nothing holding them together.

For the progression of heights this means: the three pieces differ in height but share something else – the same material or the same basic form. Height alone is not enough to turn three objects into a group.

Colour is the trickiest point here. Two tones from the same family – sand and beige, two shades of grey – hold a group together even when material and form diverge. Three clearly different colours do not.

Close enough together

Objects belong together visually when they almost touch. The gap between the pieces should be smaller than the width of the smallest object – otherwise the eye reads them as separate items.

And they do not stand in a row. A slight staggering forwards and backwards turns a line into a group. With three pieces, a triangular arrangement is the most reliable – two at the back, one offset at the front.

The smallest piece belongs at the front and the tallest at the back. The other way round, the large one hides the small one, and the group loses one of its three heights. To check the arrangement, go to the viewpoint from which the room is usually seen – from the sofa, from the door – and check whether all three silhouettes remain visible.

What goes in

Not every vase needs flowers. In a group of three it is enough for one to be filled – ideally the middle height, so that the silhouette stays balanced.

Two notes on materials. Natural stone such as travertine or marble is often not watertight: the stone is porous, absorbs moisture and can leave rings on the surface it stands on. Such pieces are intended for dry arrangements – dried flowers, grasses, branches. If you still want to use them with water, place a slender glass vessel inside that keeps the water away from the stone.

The second note concerns the opening. A very narrow opening holds a single bloom or a branch, not a bouquet – several stems stand too tightly in it and bend at the rim. A wide opening takes both, but needs enough stems so that the flowers do not fall apart: a bouquet should fill the opening to the point where the stems hold each other up.

A curved neck solves this by itself. It gathers the stems at the narrowest point and lets the blooms fan out above it – which is why such forms work for single flowers just as well as for larger bouquets. Straight cylinders lack this help; there, the quantity alone decides.

As a rule of thumb for proportion: vase and flowers together come to roughly one and a half to two times the height of the vase. Noticeably shorter looks cut off; noticeably longer becomes top-heavy.

Where the group stands

On a clear surface, not in the centre but offset to one side. Groups placed in the centre look like an altar; slightly off-centre they look casual.

On a dining table an additional rule applies: the objects stay below the eye level of those seated, that is, below about 30 cm (11.8 in). Anything taller stands in the way of conversation.

On a sideboard or a chest of drawers this does not apply – there the tallest piece may well rise above the eye level of those seated, because nobody looks over it. More important here is the relationship to the surface: the group should take up about a third of the length and not be pushed into the corner.