This proves, said Kant, that man's concepts are only a delusion, but a collective delusion which no one has the power to escape.

Hearing this collective delusion voiced, she looked for its maker, and there - standing on a high rock, surveying the atrocities, was Immacolata.

In her mind, the likelihood that all this was a collective delusion diminished a little.

We live with the consequences of a quite extraordinary collective delusion.

Instead, it's a movie about mass hysteria and collective delusion.

But this isn't the result of collective delusion.

The Eastern cougar was hunted to extinction long ago, so game experts figure the phantom is either a dog or collective delusion.

Andrew Simms: Extraordinary collective delusion caused the financial crisis.

Not surprisingly, value investors view today's technology stock prices as a sign of collective delusion.

In other words, by building up a collective delusion.