This is similar to the concept of protecting groups in chemistry, that can be removed easily later on.

Eaters coordinate very effectively, and in a very useful way, to dominoes:

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`x = 10, y = 5, rule = B3/S23`

2b2o$bobo4b2o$bo2b2o2bo$2o4bobo$6b2o!

Now, while that example seems a bit pointless, I think that for more useful structures where you want a domino to appear at some point (namely, when a glider takes the eater off), it is not so far-fetched to conceive it as a potential way to temporarily cap still life structures.

I am going to try to find a way to remove the eater on the following pattern with a glider, without causing immediate interference to the adjacent pattern (except that that would result of manually taking away the eater):

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`x = 24, y = 24, rule = B3/S23`

2b2o$bobo$bo2b2o$2o4bo$6bo$7b2o$9bo$9bo$10b2o$12bo$12bo$13b2o$15bo$15b

o$16b2o$18bo$18bo$19b2o$21bo$21bo$22b2o$23bo$20b3o$20bo!

Any ideas or comments are welcome.