01
Distinguish an exact coordinate from a measured position
The worksheet uses exact fictional numbers. A device reading or survey observation may instead have uncertainty, rounding or a transformation between coordinate systems. Those issues require additional information and cannot be resolved by drawing a crisp dot. A SpatialProbe presentation should identify which kind of input it uses. This lets a simple mathematical example remain simple while avoiding an unsupported claim of real-world precision. If a later application uses measured locations, record the coordinate reference and uncertainty separately from the rule that decides whether a point belongs to a region.
02
Choose a boundary convention for the intended task
A closed rectangle includes all four edges. A different convention can include the left and bottom edges while excluding the right and top edges. The latter is useful for partitioning adjacent rectangular cells without assigning their shared edge to both. Neither convention should be introduced halfway through a calculation. State it before presenting the results, and keep the wording consistent in the table and diagram. SpatialProbe can make that choice part of the explanation, helping people understand why a point that looks visually adjacent may receive a different classification.
03
Keep inspection graphics legible without colour alone
Use labels for points and named boundaries in addition to coloured marks. Put the coordinate rule near the picture so a cropped image still carries the essential context. The compound SpatialProbe is readable with both word initials capitalised, and a restrained interface can let the selected point provide the visual focus. A result should identify the specific comparison that passed or failed, especially at a boundary. This gives the project a clear communication style that can work across a diagram, a prototype interface and a printed activity sheet.