Draw an accordion in Aquarell: connect bellows folds between the end boxes

Accordion bellows drawn as black-and-white bars may fail to connect with their end boxes. Draw an invented slightly opened button accordion without a player, using six fold groups to inspect front-to-top continuity. Buttons are exterior details without assigned pitches or fingering. Layers separate boxes, folded planes and detail; opening and count are choices for this drawing, not simulated mechanical deformation.

Set the end boxes and their separation

Use an approximately 1900×1400 px landscape canvas with a pale grey-blue background. Draw narrow left and right end boxes separated by the bellows region, sharing one view of top surfaces and side depth rather than facing unrelated ways. Lightly join their upper and lower edges to bound bellows height. Separate sketch, left box, right box, bellows and buttons. Inspect the two ends around one central region in one colour. Correct an unexplained height offset or deliberately choose torsion; begin simply rather than concealing misalignment under confused folds.

Distribute six fold groups on one face

Mark six groups across the front bellows face, each containing a ridge and neighbouring valley rather than counting every fine line as a group. Perspective may compress spacing slightly without inexplicably reducing the final group to a line. Alternate pale and mid-grey planes initially. Count one through six and inspect remaining room at each box junction. If they resemble six independent blocks, weaken separate outlines and connect planes continuously. If flat, moderately separate adjacent values. Six is a simplified design count, not the actual bellows count of a particular model.

Join top folds to front folds at the corner

Use the same six groups on the visible top, joining corresponding ridges and valleys across the front/top boundary. Do not hide six-front/seven-top misalignment under a black edge. Trace groups one, three and six across the turn in one sketch colour, then complete the rest. Compress visible top depth with viewpoint rather than vertically copying front stripes. If they resemble unrelated striped sheets pasted to a box, repair boundary endpoints. This concerns one exterior fold group across surfaces, not internal airtight construction or manufacturable unfolding dimensions.

Attach the bellows ends to both boxes

Fit both bellows ends against the inner box sides, perhaps leaving a narrow seam but no background-colour gap that makes the centre float. A box may hide part of an outer fold without swallowing an entire first or sixth group while still being described as six fully visible groups. Hide buttons and decoration and identify the beginning and ending edges. If it resembles loose paper clamped between boxes, correct seam thickness and side continuity rather than endlessly widening end frames. Different materials may use different colours and values while remaining visibly attached.

Keep buttons on their supporting box planes

Use muted deep red-brown boxes, placing a few small round buttons on one and a simple grille on the other rather than another piano keyboard. Align buttons with their supporting face, compressing circles on an oblique plane instead of floating viewer-facing white beads outside it. Choose counts freely but note the row count so editing does not accidentally add another. Simplify grille lines into broad regions and frame. If decoration dominates the six bellows groups, reduce contrast or detail rather than adding glints. The invented button arrangement is exterior design, not a real playing layout.

Shade folds under one light source

Assume upper-left light, with warm-grey front bellows and a somewhat lighter top. Alternate planes rhythmically without mechanical black/white extremes. The right may darken overall without reversing illumination abruptly within one group at the corner. Restrained box-edge reflections distinguish the harder ends from softer bellows material. If metallic fins, reduce extreme contrast and sharp edges. If flat paper pattern, clarify continuous ridges and valleys. Hide patterns and inspect broad values first, then add restrained colour variation. Detail cannot replace alignment or conceal incorrect counts in darkness.

Change spacing and box separation together

Sketch a separate more-closed version, bringing boxes closer and shortening all six fold intervals while keeping group count unchanged. Do not compress only the pattern within unchanged box spacing, or delete two groups and call it the same instrument closing. Maintain group-by-group front/top joins, using numbered guides if needed. The pair should show which is more open without implying actual volume or airflow. This compares exterior relationships without automatic deformation. If closed folds crowd, simplify visible detail while retaining the six-group sketch rule rather than replacing layers with meaningless black blocks.

Inspect corners and end seams in output

Save the layered original and inspect corner joins for groups one, three and six plus both end seams in the PNG at use size, excluding background-colour gaps. If top lines merge into a dark band, reduce line contrast or increase display size rather than adding a group for density. If buttons merge into a white stripe, reduce count or adjust local spacing within the chosen design. Keep the numbered framework. A new viewpoint requires redrawing the top rather than skewing old stripes and skipping checks. Record a definite mismatch, such as the third top valley joining group four, instead of asking for greater complexity.

Related tutorials and sources

Draw a folded map in Aquarell: turn printed lines with the folds; Draw a folding fan in Aquarell: bring pleats and ribs to one pivot.

Sources checked on 7 November 2026: the official Aquarell App Store listing and Apple Lookup show version 1.0.7, requiring iOS / iPadOS 15.0 or later. The drawing uses the publicly described brush, colour, layer and saving capabilities manually. Sizes, shapes and colours are practice suggestions; confirm controls against the installed version. Keep the native artwork for further editing and use PNG for previews. This batch does not claim step-by-step device testing.