Examples of invisibility

Claude goes through a purse in a busy sidewalk café without attracting attention...

… is able to steal in secret...

… and is an undetectable thief.

Peter duplicates the power and their invisible struggle upsets items on a street vendor's table. (Godsend)

Mimicking Claude's power, Peter fades from view...

...and reappears...

...as Claude leaves. (The Fix)

As they walk down a New York City street and invisibly bump into people, steal personal effects, and disrupt pedestrian traffic. (Distractions)

Isaac paints an invisible Claude and Peter at a street corner…

…Claude snatching a purse while invisible...

… a partially invisible Peter…

…and footprints of Peter and Claude while invisible.

As Peter begins to access powers he has previously duplicated, he flashes through Claude's invisibility. (Unexpected)

On the roof of the Deveaux Building, Mr. Bennet and the Haitian use infra-red optical devices to find the invisible Claude and Peter.

Claude turns invisible as he leaves Peter's apartment.

After Isaac pulls a gun on Peter, Peter hides by turning invisible.

Peter turns invisible once more, and flees Isaac's apartment. (Unexpected)

Claude listens to Mr. Bennet's entire interview in Thompson's office.

Claude becomes invisible as he falls over the side of bridge after being shot by Mr. Bennet. (Company Man)

Claude enters Meredith's apartment unseen.

Claude's invisible legs catch fire. (Hell's Angel)

During a fight, Peter hides from Sylar who is excited to "try that"...

...but Sylar finds him regardless. (.07%)

Peter reveals himself to Niki.

Watch as Peter appears.

...later Peter becomes visible as he arrives to rescue Future Hiro and Ando. (Five Years Gone)

Peter turns Claire invisible with him. (Landslide)

Peter uses invisibility to escape Nathan...

...and becomes visible again as he arrives at a deserted street. (How to Stop an Exploding Man)

While invisible, Claude hands Haram drugs...

...runs down a dock...

...and spies on Rollo Fusor.(Golden Handshake, Parts 1)

Claude enters a Paris hotel, and becomes unseen...

...along with a dagger. (Golden Handshake, Parts 2)

Claude grabs a tree branch, unseen by Rollo Fusor's accomplice. (Golden Handshake, Part 4)

On November 8, 2006, Peter becomes invisible to hide from a New York City police officer, just before he is captured by Elle and Bob. (Four Months Ago...)

Peter becomes invisible to enter the Pinehearst building.
(Dying of the Light)

Claude attacks Elle, and she doesn't see him coming.
(Sum Quod Sum, Part 1)

Elle's lightning makes Claude almost completely visible.
(Sum Quod Sum, Part 1)

Noah seemingly sits alone...

...but when Ivan arrives, Claude reveals himself to him.
(Comrades, Part 1)

Claude becomes visible in front of the Russian.
(Comrades, Part 1)

Claude reveals himself to Sparrow, Abigail, and West...

...he turns invisible...

...and plows through Danko's agents while remaining unseen.
(Rebellion, Part 3)

Claude hides Molly and takes her somewhere safe.
(Rebellion, Part 7)