Two Kähler vases keep landing on the same shortlist: the grooved Hammershøi and the striped Omaggio. They stand within a centimetre of each other and do the same job on a table, yet they come from different clays, different designers and different kinds of hand work. Here is what actually separates them.
Grooves or stripes: the surface is the decision
The Hammershøi Vase H21 cm carries fine horizontal grooves turned into the body itself. Hans-Christian Bauer drew them from the work Svend Hammershøi made at Kähler's workshop in the early twentieth century, and the result is deliberately quiet: the decoration is the form, so one colour is enough. Light runs down the ridges and gives the profile a rhythm that holds up even when the vase stands empty.
The Omaggio Vase H20 cm works the other way round. Its form is plain and the stripes are painted on by hand, which is the point of the name: omaggio is Italian for tribute, and Stilleben meant it as a tribute to Kähler's craft heritage. Each band is laid on individually, so two vases in one colour are rarely identical, and the pattern carries across a room in a way the Hammershøi grooves never attempt.

Porcelain against faience
Hammershøi is porcelain. It fires dense and fine and holds a crisp edge on every groove, which matters a great deal when the whole decoration depends on the shadow those ridges cast.
Omaggio is faience: an earthenware body under an opaque glaze, the traditional ground for painted decoration in European ceramics. That is why the stripes read as flat colour sitting on a smooth field rather than sinking into it.
You can feel the difference before you read a label. The Omaggio Vase H20 cm weighs 1 kg. The Hammershøi Vase H21 cm, one centimetre taller and one centimetre wider, weighs 1.5 kg. The Omaggio Circulare Vase H20 cm anthracite grey sits between them at 1.3 kg: the same silhouette and the same painted stripes as the standard Omaggio, but made in eco clay through a circular production route and finished matt.

The four vases side by side
| Detail | Hammershøi H21 cm | Hammershøi H25.5 cm | Omaggio H20 cm | Omaggio Circulare H20 cm |
|---|---|---|---|---|
| Height | 21 cm | 25.5 cm | 20 cm | 20 cm |
| Diameter | 17 cm | 20 cm | 16 cm | 16 cm |
| Weight | 1.5 kg | 2.38 kg | 1 kg | 1.3 kg |
| Material | Porcelain | Porcelain | Faience | Eco clay |
| Designer | Hans-Christian Bauer | Hans-Christian Bauer | Stilleben | Stilleben |
| Surface | Turned horizontal grooves | Turned horizontal grooves | Hand-painted stripes | Hand-painted stripes, matt finish |
| Colours | White, Anthracite grey | White, Anthracite grey | Black, Mother of pearl, Silver | Anthracite grey |
| Best for | A single stem or a small bunch | Longer stems and fuller bouquets | Graphic contrast on a plain table | A quieter reading of the same stripes |
Height, diameter and what each one carries
The three 20 to 21 cm vases are close enough that height alone will not settle it. Diameter and weight will. At Ø17 cm and 1.5 kg, the Hammershøi H21 gives a bunch a wider mouth to spread into and a heavier foot to lean against. The Omaggio at Ø16 cm and 1 kg is the lighter, narrower one, which suits a tighter handful of stems and a shelf where the vase is often moved.
The Hammershøi Vase H25.5 cm is the one to reach for if you buy flowers by the armful. It stands 25.5 cm tall, measures Ø20 cm and weighs 2.38 kg, close to a kilogram more than the H21. Florists tend to cut stems to roughly one and a half times the height of the vessel, so the taller Hammershøi is the piece that will take long tulips or branches without looking overloaded, and the extra mass keeps the base planted while they lean.
A practical note on pairs: because the H21 and the H25.5 share the same grooved language and the same two colours, they group well as a set of two heights on one surface. The Omaggio pieces prefer to stand alone, since two striped vases side by side start to compete.
Colours and how they behave in a room
Hammershøi keeps to White and Anthracite grey in both heights. White reads almost as a piece of architecture and lets the grooves do the work; anthracite grey pulls the shadow lines deeper and turns the vase into a dark, sculptural mass that anchors a light table.
Omaggio is the more expressive family: Black, Mother of pearl and Silver. Black is the graphic one and the stripes are at their most legible. Mother of pearl and Silver behave like metallics, shifting with the light through the day rather than holding one tone. The Omaggio Circulare in anthracite grey takes the loudest element of the series and calms it down with a matt surface, which is useful if you like the stripes but not the shine.
Kähler has made ceramics in Næstved, south of Copenhagen, since 1839, and the house glazes still vary slightly from piece to piece. Two vases in the same colour will rarely be exactly the same, which is a feature of the making rather than a fault.

Which one belongs on your table
Choose Hammershøi if you want the vase to sit quietly inside a room you have already composed, if you prefer texture to pattern, and if porcelain is the material you like to handle. Start with the H21 for everyday stems and add the H25.5 when you want height.
Choose Omaggio if the vase should be the thing people notice, if you want colour and pattern rather than relief, and if you like the idea of an object whose decoration was drawn on by a person rather than turned by a lathe. Take Circulare instead of the standard Omaggio if you want the stripes without gloss and prefer a clay made on a circular route.
Both families ask for the same care: wipe with a damp cloth, and keep them out of the dishwasher. If you are still weighing the two, see the full Kähler collection and compare the grooves and the stripes across jugs, bowls and cups as well as vases.
