How can I take the items in the museum?

Hint 1 of 13:

Look at the indentations next to the items.

Hint 2 of 13:

They're shaped like octohedrons.

Hint 3 of 13:

You need to find something to match the colors surrounding indentations to
get the items.

Hint 4 of 13:

Not all the items can be taken, but you'll find the appropriate jewels to get
several of the items.

Hint 5 of 13:

In particular, you can take the photo with a green-green jewel (from
elsewhere in the octospider city), and the yellow-red jewel with a
blue-yellow one (from the human city).

Hint 6 of 13:

You will also need the prism, but there is no matching jewel for it.

Hint 7 of 13:

You can find something with the appropriate colors to open the lock, though.

Hint 8 of 13:

Think about what a prism does.