See requires no attention or focus from the person doingthe seeing. It takes a direct object withouta preposition. Look requiresconscious effort on the part of the person doing the looking. Anobject of look, if expressed, must be preceded by a preposition (usuallyat, over, or for).
We saw the prototype of the new robotstanding in a corner of the office.
After watching the promotional video, we lookedat the prototype of the new robot.
We studied the specifications carefully, then lookedover the prototype of the new robot.
We looked for the prototype of the new robotin the promotional video but could not find it.
See also hear/listen.
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