A logo mark is the smallest, hardest-working thing you'll ever draw. It has to hold up as a 16-pixel favicon and on a two-metre shopfront, in one colour and in four. Most logos that fall apart later don't fail because the idea was weak — they fail because of small technical errors that were easy to fix at the sketch stage and painful to fix once the brand is live. Here are the mistakes I see most often, and how to catch them early.

Weak Geometry and Wobbly Construction

If the underlying structure is loose, no amount of clever detailing will save it. Marks that look "almost right" usually have geometry that was drawn by eye and never properly resolved.

• Circles that aren't circles. A shape drawn freehand, or built from Bézier points that were nudged until they looked round, will read as slightly lumpy at large sizes. Draw true circles and true arcs, then scale them from a shared base unit.
• Tangents that don't quite meet. Where a curve joins a straight edge, the transition should be seamless. Zoom in hard: if you can see a tiny kink or a flat spot, it will be obvious when the mark is printed at A2.
• Inconsistent stroke weights. If the horizontal strokes of your mark are visually heavier than the verticals, the whole thing will feel unbalanced. This is normal in type design and needs correcting in marks too.
• Odd corner radii. Three corners at 4mm and one at 5mm is the kind of detail nobody consciously notices but everybody senses. Build on a grid and reuse values.

A quick test: fill the mark in solid black and squint. If it reads as an indistinct blob rather than a recognisable silhouette, the shapes are fighting each other, not working together.

Ignoring Optical Balance

Mathematics and perception disagree constantly, and the mark has to satisfy the eye, not the coordinate panel.

• Circles and triangles need overshoot. A circle whose bounding box is exactly the same height as an adjacent square will look smaller. Extend curves slightly beyond the cap line, and give pointed shapes a little extra room so they don't appear to shrink.
• Optical centring, not bounding-box centring. A triangle placed dead centre by its bounding box will look off to one side. Nudge it until the visual weight sits where it should.
• Uneven negative space. The gaps inside and around a mark should feel as if they belong to the same family. Measure them, then trust your eye and adjust — usually by a fraction of your base unit.

Overcomplicating the Mark

Detail is the enemy of reproduction. The most common cause of a logo failing in the real world is that it was designed for the screen at 100 per cent and nothing else.

• Hairlines that vanish. Anything thinner than a single pixel at small sizes will disappear or turn grey. Set a minimum stroke weight and stick to it.
• Gradients, glows and shadows as load-bearing elements. If removing the effect destroys the idea, the idea isn't finished. Effects should be a bonus version, not the default.
• Fine interior detail. Tiny counters and intricate inlays die in embroidery, single-colour newsprint and etched signage. Simplify hard, then simplify again.
• Too many ideas. A mark that carries three concepts usually communicates none of them. If you need a paragraph to explain it, it belongs in the brand story rather than the logo.

Spacing, Lockups and Typography

Marks rarely travel alone, and the relationship between symbol and wordmark is where a lot of good work gets undone.

• Gaps set by bounding box. Space the wordmark from the symbol based on an optically judged gap, often derived from a recurring feature in the mark — the width of a stem, for instance — so the relationship holds at any size.
• Lazy letter spacing. All-caps wordmarks usually need a little positive tracking; lowercase pairs need real kerning. Default settings are a starting point, never a final answer.
• Indecisive alignment. Decide whether the lockup hangs from the left edge, sits centred, or aligns to a baseline, and then apply that decision consistently across every version.
• No defined clear space. Without a rule for breathing room, someone will eventually wedge the logo against a page edge. Define the minimum space as a proportion of the mark itself.

Failing to Test in Context

Before you finalise anything, take the mark out of your tidy artboard and abuse it a little. Place it on white, on black, on a mid-grey, on a busy photograph and on a coloured background you dislike. Shrink it to 16 pixels and check whether it still reads. Imagine it one colour on a receipt, embroidered on a polo shirt, and cut from vinyl for a van.

Write down the minimum size and the approved colourways, and build the reversed and single-colour versions properly rather than letting someone tick "invert" later. Then show it to two people who aren't designers and watch where their eyes go first — that tells you more than any amount of deliberation.

None of this is glamorous work, but it's the difference between a logo that survives a rebrand and one that quietly gets replaced in eighteen months. Build your geometry carefully, balance it by eye, keep it simple, control the spacing, and test it everywhere before you hand it over. Correcting these things early takes an afternoon; correcting them afterwards takes a client conversation.