How to Record the Hollow Air Core Inside Charybdis’s Water Column

Record Charybdis by keeping three elements distinct: the transparent cylinder, the rotating water it contains, and the hollow air core within that water. Establish their shapes and relationships before adding surface detail.

The task is to make a precise written or drawn record of this particular arrangement. William Pye’s official description confirms circularly moving water inside a transparent acrylic cylinder, with an air-core vortex at its centre. Those material relationships provide the foundation for the record. William Pye: Charybdis (https://williampye.com/works/charybdis/)

The supplied Instagram reel could not be retrieved for direct inspection. The method below therefore uses the artist’s verified description and independently researched drawing concepts; it makes no claims about that reel’s framing, colours, camera movement or sequence. Any suggested drawing treatment is an illustrative choice.

Establish the cylinder, water and air as separate forms

Begin with a plain structural sentence: “A hollow air core sits within rotating water contained by a transparent acrylic cylinder.” This preserves the nested arrangement without adding a viewpoint, a particular core profile or an explanation of how the sculpture operates.

Keep the container separate from its contents in your vocabulary. “Cylinder” names the outer acrylic enclosure; “water” names the surrounding moving material; “air core” names the hollow region within it. Calling everything a water column can be convenient, but a detailed record should still distinguish those three elements. The artist explicitly identifies the enclosure as acrylic, so use that material name rather than substituting glass. William Pye: Charybdis (https://williampye.com/works/charybdis/)

Before describing texture, make a short inventory of the boundaries you can actually distinguish in your reference:

• The outer left and right limits of the transparent cylinder.

• The visible upper boundary of the water, if shown.

• The left and right boundaries of the air core.

• Any lower continuation or ending of the core that is clearly visible.

An unclear boundary should remain unclear in the record. If the lower core disappears behind a reflection or leaves the frame, describe where visibility ends. Do not extend it to the cylinder’s base simply to complete the shape. This keeps the visible evidence separate from a proposed reconstruction.

Fix one viewpoint before comparing shapes

Choose a single reference view for the main drawing or description. Note whether it looks across the cylinder, down into it, or from an intermediate height. Then keep that viewpoint consistent while comparing the enclosure and the core. A second view can be recorded separately when it reveals a boundary the first view conceals.

Use positions within the image rather than unsupported dimensions. Ask where the core’s visible top begins, how its width compares with the cylinder at the same height, and whether the gaps between core and enclosure appear equal on both sides. These comparisons describe the selected view without claiming measured dimensions of the sculpture.

The National Gallery of Ireland’s drawing exercise starts with outlines of basic forms and then examines their arrangement, interactions and intervening spaces. Adapt that approach here by checking the spaces occupied by water between the core boundary and the outer cylinder before adding smaller marks. This is a proposed application of its observational method. Drawing Activity: Shapes and Spatial Relations (https://www.nationalgallery.ie/drawing-activity-shapes-and-spatial-relations)

For an illustrative drawing exercise, mark three horizontal comparison levels: near the highest visible part of the core, around its middle, and near its lowest clearly visible part. At each level, compare the core’s width with the enclosure’s width. These are working guides, not features of Charybdis, and their placement should follow the reference rather than an assumed regular shape.

Draw the hollow core as a bounded space

Give the core its own contour study before shading the whole cylinder. Trace only the visible boundary between air and water. Check whether that boundary remains straight, curves, narrows or changes direction at different heights. Record whichever profile the reference supports; the term “air core” alone does not supply its exact outline in a particular view.

Contour drawing provides a useful starting technique. The National Gallery of Art describes it as using continuous long lines to convey shape and advises against repeatedly retracing an outline. For this scene, an initial contour study can help you distinguish a core boundary from neighbouring surface detail. Lesson: Drawing Everyday Objects (https://www.nga.gov/educational-resources/lesson-drawing-everyday-objects)

Treating the core as a negative-space study is an illustrative drawing strategy: concentrate on the shape of the opening within the surrounding water. The National Gallery of Ireland recommends examining shapes made by spaces between objects. Applying that exercise to Charybdis directs attention to the hollow region’s contour and proportions. Drawing Activity: Shapes and Spatial Relations (https://www.nationalgallery.ie/drawing-activity-shapes-and-spatial-relations)

Do not automatically fill the core with solid black or leave it pure white. Either treatment may make a sketch legible, but it becomes a stylistic choice unless it matches the reference. First note the actual light and dark areas within the apparent opening. If you simplify them, label the sketch as a contour study or tonal simplification.

Keep transparency distinct from water movement

Work through the image in separate passes. First establish the enclosure’s visible outline. Next place the core boundary. Then add the marks needed to describe the water and the transparent surfaces. This order is an editorial drawing recommendation, designed to prevent abundant surface detail from obscuring the central arrangement.

Before copying a conspicuous streak or bright patch, ask what you can establish about it. Is it part of a stable boundary? Does it appear only briefly? Can you tell which surface it belongs to? When its role is uncertain, describe its appearance and location: for example, “a narrow bright vertical band near the right edge.” That example supplies wording, not an observed feature of the supplied reel.

Varying pencil pressure and using hatching are available ways to organise tone. The National Gallery of Art explains that pressure produces lighter and darker areas and that closely spaced hatch lines create darker passages. As an illustrative treatment, you could reserve strong marks for clearly visible boundaries and use lighter marks for uncertain surface detail. Check the result against the reference rather than treating line weight as a material rule. Lesson: Drawing Everyday Objects (https://www.nga.gov/educational-resources/lesson-drawing-everyday-objects)

Record motion without inventing a change sequence

Pye’s description establishes circular movement of the water. It does not establish the direction of rotation from your chosen viewpoint or a particular sequence of changing core shapes. Record those details only when they can be followed in an accessible moving reference. William Pye: Charybdis (https://williampye.com/works/charybdis/)

When working from a clip, separate changes in the subject from changes in the view. Compare the cylinder’s position and visible top between moments. If the camera position changes, keep that information alongside the core sketch so that a different-looking outline is not automatically recorded as a transformation of the core itself.

Use additional sketches only for distinct visible changes. Keep their scale and viewpoint as consistent as the reference permits, and describe the transition between them in ordinary language. If an edit interrupts the view, note the interruption rather than supplying the missing transition. If no distinct change can be established, one structural drawing and a note that the water rotates are sufficient.

Check the finished record for material and spatial clarity

Read the description without looking at the sketch, then inspect the sketch without reading its labels. Both should preserve the same arrangement. Use these questions to locate specific omissions:

• Is the transparent acrylic enclosure identifiable?

• Is water shown or described around the air core?

• Does the hollow region remain distinct from a solid central object?

• Are the core’s visible proportions tied to one stated viewpoint?

• Are uncertain boundaries and illustrative choices identified?

• Does every claimed change have an observed beginning and ending?

A concise caption can anchor the finished record: “William Pye’s Charybdis: a hollow air core within rotating water, enclosed by a transparent acrylic cylinder.” Add viewpoint, contour, tone and motion details only as the reference supports them. The record is complete when the reader can reconstruct the enclosure, the surrounding water and the hollow centre without needing invented details to connect them.

Sources

• William Pye, Charybdis (https://williampye.com/works/charybdis/).

• National Gallery of Art, Lesson: Drawing Everyday Objects (https://www.nga.gov/educational-resources/lesson-drawing-everyday-objects).

• National Gallery of Ireland, Drawing Activity: Shapes and Spatial Relations (https://www.nationalgallery.ie/drawing-activity-shapes-and-spatial-relations).