01
Locate the opening before placing the drawing
The circular window extends from x=5 to x=7 and from y=3 to y=5. The left and right panel edges are each 5 cm from the opening, while the top and bottom edges are each 3 cm away. These distances describe the flat layout, not a recommendation for material strength. Draw the panel and opening at the same scale. Then identify the small part of the illustration intended to appear through the window. Keep the full illustration as a separate layer so the closed view and the open view remain easy to compare.
02
Compare the opening with the whole panel
The rectangular panel has an area of 96 square centimetres. The circular opening has an area of pi square centimetres, approximately 3.14. The opening therefore occupies about 3.27 percent of the panel area. This small proportion can help describe the proposed composition, but it does not measure how surprising or attractive the reveal will be. An illustration with one recognisable detail in the opening may read differently from a texture in the same space. Record the intended visible detail alongside the geometry instead of letting the percentage stand in for the design decision.
03
Record what remains to be tried in a prototype
The reusable plan contains panel dimensions, coordinate origin, opening shape, centre, radius, artwork position, intended closed view and intended open view. Add separate notes for alignment, material and construction questions. This example has not established how the layers are joined or whether the artwork shifts when handled. A physical prototype would provide observations about those details. Preserve the flat plan beside any revised version so a change in window size or artwork placement can be traced. The worksheet prepares a design experiment without claiming that the experiment has already been performed.