Question

in what sense do the bright colors of autumn dupe us

Answer 1

It tricks us because the colors blend with our earth tone colored clothing (accessories also) you could do this test to show you

buy or borrow a shirt that has nothing but autumn leaves on it(I pasted a photo of what it would look like) then take a white undershirt and place autum leafs on it.
Does it not look similar? that's how the bright colors trick our eyes. because  of the bright and earth tone colors 

Answer 2

Answer:

"Why Leaves Turn Color In The Fall" is an essay by Diane Ackerman. The essay is written in common English.

Explanation:

Ackerman's love for science and calls herself a nature writer. In her essay she had put light on the "why leaves change color," and "How is the color different in different places." She tells that the leaves change their colors when the chlorophyll breaks down.  

"A turning leaf stays partly green at first, then reveals splotches of yellow and

red as the chlorophyll gradually breaks down."

When she says when in autumn the leaves change their colors, they dupe or trick us. The author's purpose when saying this is revealed in next lines of the essay.

"Colored like living things, they signal death and disintegration."

The leaves trick us because though they become in bright in color when they fall in autumn, showing the liveliness through the color, they signal death.