Once you see it you can't unsee it logos

The short answer

"Once you see it, you can't unsee it" logos contain a second image that viewers often miss at first. After someone notices it, they tend to see it every time. The hidden image is usually made from negative space, which is the empty area between or around the drawn shapes. Sometimes it comes from a single shape that reads as two different things.

The effect relies on figure-ground: how a viewer separates the object (the figure) from its background (the ground). In these logos, the designer shapes the background so that it also forms a recognisable figure. The viewer can therefore read the mark in two ways.

Well-known examples

• FedEx: the white space between the capital E and the lowercase x forms a right-pointing arrow.
• Amazon: the curved arrow under the wordmark runs from the a to the z and also resembles a smile.
• Toblerone: a bear is visible within the mountain outline.
• Baskin-Robbins: the pink portions of the BR monogram form the number 31, a reference to the brand's well-known flavour count.
• Tostitos: the two t letters and the dotted i between them read as two people sharing a chip over a bowl of salsa.
• Formula 1 (logo used before the 2018 redesign): the gap between the F and the speed lines forms a 1.
• Pittsburgh Zoo: the negative space around a tree trunk shows the profiles of a gorilla and a big cat facing each other.
• Goodwill: the lowercase g doubles as half of a smiling face.

Brands revise their logos over time, so a hidden element in one version may be changed or removed in another. These descriptions are not official brand specifications. If you need a current version, check the brand's own guidelines.

Why the effect is hard to unsee

An ambiguous figure-ground image can be organised by the eye in more than one way. Before the hidden shape is pointed out, the background simply looks empty. Once the viewer has registered it as a figure, it tends to stay that way, and the shape becomes part of how they read the logo. Claims that hidden-image logos are measurably more memorable or effective are common. No supporting data was supplied for this guide, so treat any such claim as unverified.

How hidden-image logos are built in vector artwork

Vector artwork describes shapes as paths defined by anchor points and curves rather than as a grid of pixels, so it can be scaled without losing sharpness. In most hidden-image logos, the second image is not drawn as a separate object. It is the gap left between filled shapes, which means its edges are the edges of the neighbouring letters or forms. Changing one shape changes the hidden one as well.

• Shared contours: one edge serves both the visible shape and the hidden one, so it has to be drawn to satisfy both readings.
• Custom spacing and letterforms: the gaps between letters (adjusted through kerning) and the letter shapes themselves are often modified so the negative space forms a clean figure. A stock font at default spacing rarely produces the effect by accident.
• Compound paths: a compound path is a single object in which overlapping paths cut holes in one another. Building the hidden shape as a true hole keeps it transparent.
• Boolean operations: tools such as Pathfinder or shape-builder functions unite, subtract or intersect paths, which helps carve the hidden shape precisely.
• Outlined type: converting text to outlines turns letters into fixed paths. The negative space then cannot shift if a font is missing, substituted or re-rendered.

Keeping the hidden shape intact when delivering artwork

• Make the hidden shape a real hole, not a white-filled shape. A white fill looks correct on a white background but appears as a white patch on coloured or photographic backgrounds and in reversed versions.
• Check reversed and single-colour versions. In a knockout, the ink is left out so the background or material shows through. The hidden figure must still read when the colours are inverted or reduced to one.
• Test at small sizes. Narrow gaps can visually close up, which destroys the second image. Minimum reproduction sizes should come from the logo's own guidelines or from testing; no specific figures were supplied for this guide.
• Ask your printer about narrow gaps. Ink spread on paper can narrow fine negative spaces, and processes such as embroidery, engraving or vinyl cutting have their own limits on detail. The printer or fabricator can tell you their tolerances.
• Avoid adding strokes or outlines around the mark unless the guidelines specify them, because a stroke can fill in the gap that forms the hidden shape.
• Inspect paths in outline or wireframe view for stray points, overlapping duplicate shapes or unjoined edges that could create slivers in the negative space.

Sourcing and checking existing logo files

A file extension such as SVG, EPS, AI or PDF does not prove that a logo is fully vector. The file may wrap an embedded raster image, contain live text that depends on installed fonts, or be locked against editing. Open it and view it in outline mode to confirm the content is clean, editable paths.

Having a logo file also does not mean you have permission to use it. The logos listed above are trademarks, and their use is governed by the owners' brand policies and the law. Closely imitating a well-known brand's hidden-image device in a new logo may also carry trademark risk. Get qualified legal advice where that is a concern.

Deciding whether to use a hidden image in your own logo

The following are design recommendations, not documented requirements. The primary reading of the logo should work on its own, with the hidden image as an extra layer that people may or may not notice. The hidden element is most persuasive when it connects to the brand's meaning, as with the FedEx arrow suggesting movement.

Also check for unintended hidden images. Negative space can form shapes the designer never planned, including embarrassing ones. Before finalising a mark, review it at small sizes, in solid silhouette, rotated and upside down, and ask people unfamiliar with the project what they see.